nymphe
Alternative spelling of nymph.

nymphet
A small nymph.
A sexually attractive girl or young woman.

nymphets
plural of nymphet

nymphette
Alternative form of nymphet.

nymphettes
plural of nymphette

nymphon
sea spider

nymphosis
The passage from the larval state to the nymph state of an insect.

nymphs
plural of nymph

nyula
The ichneumon, or Egyptian mongoose.

nyulas
plural of nyula

oarfish
A large, greatly elongated, type of fish of the family Regalecidae.

oarfishes
plural of oarfish

oarman
Alternative form of oarsman.

oarmen
plural of oarman

oarsman
A person who rows a boat, either alone or with others.

oarsmen
plural of oarsman

obligala
A formal ball which two characters (usually Fox Mulder and Dana Scully) are required to attend as a set-up in romantic fan fiction.

obligalas
plural of obligala

oblique-swimming triplefin
A blenny fish, Obliquichthys maryannae

obol
A silver coin of Ancient Greece.
A weight, equivalent to one sixth of a drachma.

oboli
plural of obolus

obolid
Any member of the family Obolidae of lamp shells.

obolids
plural of obolid

oboloi
plural of obolos

obolos
Alternative form of obolus.

obols
plural of obol

oboluses
plural of obolus

oboo
Alternative form of ovoo (“Mongolian cairn”).

oboos
plural of oboo.

obtectomeran
Any moth in the clade Obtectomera.

obtectomerans
plural of obtectomeran.

occupationaire
A member of the Allied military forces that occupied Japan at the end of World War II.

occupationaires
plural of occupationaire

ocean perch
A fish of species Sebastes norvegicus, of the North Atlantic.

ocean pout
A fish, Zoarces americanus

ocean sunfish
A large, heavy species of bony fish, Mola mola, native to tropical and temperate waters around the world.

ocean sunfishes
plural of ocean sunfish

oceanaria
plural of oceanarium

oceanarium
A park where visitors can see marine mammals and/or fish.

oceanariums
plural of oceanarium

oceanitid
Any member of the family Oceanitidae of southern storm petrels or Austral storm petrels.

oceanitids
plural of oceanitid

ocellated lizard
Timon lepidus (syn. Lacerta lepida), a large wall lizard.

ocellation
The development of eye-like markings, such as those on the wing of a butterfly or tail of a peacock.
An eye-like marking; ocellus.

ocellations
plural of ocellation

ochlesid
Any member of the family Ochlesidae of small shrimp-like crustaceans.

ochlesids
plural of ochlesid

ochotonid
Any member of the family Ochotonidae, the pikas.

ochotonids
plural of ochotonid

ocoid
Any member of the Ocoidae.

ocoids
plural of ocoid

octactinian
Any anthozoan coral of the former subclass Octactinia

octactinians
plural of octactinian

octarius
The pint (eighth of a gallon) in the apothecaries' system.

octochaetids
plural of octochaetid

octocorallian
Any coral of the subclass Octocorallia

octocorallians
plural of octocorallian

octodontid
Any of the Octodontidae, a family of rodents including the common degu (Octodon degus) and 12 other South American species

octodontids
plural of octodontid

octodontoid
Any rodent of the superfamily Octodontoidea

octodontoids
plural of octodontoid

octoon
The eighth segment of an insect.

octopodiform
A cephalopod of the superorder Octopodiformes, comprising octopuses and vampire squid.

octopodiforms
plural of octopodiform

octopodoid
A member of the cephalopod superfamily Octopodoidea.

octopodoids
plural of octopodoid

octopoteuthid
Any squid in the family Octopoteuthidae.

octopoteuthids
plural of octopoteuthid

octopussies
plural of octopussy

octopussy
An octopus.

oculinid
Any of the family Oculinidae of stony corals.

oculinids
plural of oculinid

oculogenesis
The growth and development of the eye (in the foetus)

ocypodian
A member of the crab family Ocypodidae.

ocypodians
plural of ocypodian

ocythoid
Any member of the Ocythoidae.

ocythoids
plural of ocythoid

odacid
Any of the family Odacidae of perciform fishes

odacids
plural of odacid

odiid
Any member of the family Odiidae (now Ochlesidae) of small shrimp-like crustaceans.

odiids
plural of odiid

odobenid
Any of the family Odobenidae; a walrus

odobenids
plural of odobenid

odonatan
Any member of the Odonata (dragonflies etc.).

odonatans
plural of odonatan

odontasterid
Any starfish in the family Odontasteridae

odontasterids
plural of odontasterid

odontocete
Any member of the cetacean parvorder Odontoceti; a toothed whale.

odontocetes
plural of odontocete

odontophorid
Any quail in the family Odontophoridae.

odontophorids
plural of odontophorid

odontopleurid
Any trilobite of the order Odontopleurida.

odontopleurids
plural of odontopleurid

oecophorid
Any in the family Oecophoridae of concealer moths.

oecophorids
plural of oecophorid

oedipodid
Any grasshopper in the family Oedipodidae, now considered to be the acridid subfamily Oedipodinae.

oedipodids
plural of oedipodid

oegopsid
Any member of the squid order Oegopsida or suborder Oegopsina.

oegopsids
plural of oegopsid

oestrid
Any member of the family Oestridae, the botflies.

oestrids
plural of oestrid

oestruation
The period of heat, or eagerness to mate, in animals.

oestruations
plural of oestruation

oestrum
A biting insect; a gadfly or botfly.
Something that stings or incites one to frenzy or action; an impulse or passion.
Estrus.

oestrums
plural of oestrum

offshore seahorse
A species of seahorse, Hippocampus kelloggi.

ofuro
Alternative form of furo (“Japanese bath”).

ofuros
plural of ofuro

ogac
Synonym of Greenland cod.

ogcocephalid
Any member of the family Ogcocephalidae.

ogcocephalids
plural of ogcocephalid

ogday
dog (insult)

oik
a member of the lower classes.
a person perceived as obnoxious or unintelligent.

oiks
plural of oik

oiligarch
A member of the ruling class that obtains their power from control of the oil industry.

oily bitterling
A temperate freshwater fish, Tanakia limbata, of the family Cyprinidae, that is found in central and southwestern Japan.

oinochoae
plural of oinochoe

oinochoai
plural of oinochoe

oinochoe
Alternative form of oenochoe.

oinochoes
plural of oinochoe

olachen
Alternative form of eulachon.

old maid
An old woman who has never married; a spinster.
The Madagascar periwinkle.
The common zinnia.
An unpopped kernel in a batch of popped popcorn kernels.
A card game in which cards must be paired and one undesirable card is designated "old maid".
The unmatchable card in that game.

old wife
An old woman, later especially one who tells old wives' tales.
Any of various marine fishes :
Any of various marine fishes :
Any of various marine fishes :
Any of various marine fishes :
Any of various marine fishes :
Any of various marine fishes :
Any of various marine fishes :
The long-tailed duck, Clangula hyemalis.
A chimney cap to prevent smoking.

olema
Alternative form of ulema.

olenellid
Any trilobite in the family Olenellidae.

olenellids
plural of olenellid

olenelloid
Any trilobite of the superfamily †Olenelloidea.

olenid
Any member of the family Olenidae of trilobites.

olenids
plural of olenid

oleogenesis
The biosynthesis of triglycerides in plants

oligochaete
Any of various hermaphroditic aquatic and terrestrial annelid worms, of the subclass Oligochaeta, that have single bristles along the body.

oligochaetes
plural of oligochaete

oligochete
Alternative form of oligochaete.

oligochetes
plural of oligochete

oligolecty
The preference of an insect pollinator (chiefly a bee) for pollinating only a few plant species.

oligomorph
Any oligomorphic organism.

oligomorphs
plural of oligomorph

oligophage
Any oligophagous organism.

oligophages
plural of oligophage

oligosaprobe
Any oligosaprobic organism

oligosaprobes
plural of oligosaprobe

oligotroph
An organism capable of living in an environment that offers very low levels of nutrients.

oligotrophs
plural of oligotroph

olive flounder
Paralichthys olivaceus, a temperate marine species of large-tooth flounder native to the north-western Pacific Ocean.

olive ridley
The olive ridley sea turtle