needle shell
A sea urchin.

nenia
A funeral song; an elegy.

nenias
plural of nenia

neon flying squid
A species of large ommastrephid squid, Ommastrephes bartramii, found in subtropical and temperate oceanic waters globally.

neopallia
plural of neopallium

neopallium
neocortex

nerites
plural of nerite

neritids
plural of neritid

nestlecocks
plural of nestlecock

netted olive
Oliva reticularis, a species of sea snail.

nobhead
Alternative spelling of knobhead.

nobheads
plural of nobhead

nocturia
A frequent need to arise during the night in order to urinate.

noduli
plural of nodulus

nodulus
A nodule; a little knot or lump.
The part of the vestibulocerebellum that is at the end of the vermis

norites
plural of norite

nubecula
A nebula; specifically, the Magellanic Clouds.
A slight spot on the cornea.
A cloudy object or appearance in urine.

nubeculae
plural of nubecula

nucleoconch
The embryonic shell of a foraminifera, especially the protoconch and deuteroconch of a megalospheric form.

nucleoconches
plural of nucleoconch

nucleoconchs
plural of nucleoconch

nucleolysis
The destruction of a nucleus
The hydrolysis of a nucleic acid

nudi
A nudibranch.

nudibranch
A sea slug belonging to the order Nudibranchia.

nudibranchs
plural of nudibranch

nudis
plural of nudi

nut clam
Any of the family Nuculidae of small saltwater clams.

nut clams
plural of nut clam

nycturia
nocturia

obeli
plural of obelus

obelus
A symbol resembling a horizontal line (–), sometimes together with one or two dots (for example, ⨪ or ÷), which was used in ancient manuscripts and texts to mark a word or passage as doubtful or spurious, or redundant; an obelisk.
A dagger symbol (†), which is used in printed matter as a reference mark to refer the reader to a footnote, marginal note, etc.; beside a person's name to indicate that the person is deceased; or beside a date to indicate that it is a person's death date; an obelisk.

obeluses
plural of obelus

obex
A small, crescentic fold of white matter that covers the inferior angle of the floor of the fourth ventricle.

obolus
A silver coin minted in Ancient Greece, valued at a sixth of a drachma.
A unit of weight, equal to one-sixth of a drachma.

obtuse horn shell
Cerithidea obtusa, a species of sea snail.

ocean quahog
An edible clam native to the North Atlantic Ocean, Arctica islandica.

octanolysis
alcoholysis using octanol

octapus
Misspelling of octopus.

octopi
plural of octopus

octopii
Misconstructed plural of octopus.

octopodes
plural of octopus
plural of octopode

octopus
Any of several marine molluscs of the order Octopoda, having no internal or external protective shell or bone (unlike the nautilus, squid and cuttlefish) and eight arms each covered with suckers.
A mollusc from genus Octopus.
The flesh of these marine molluscs eaten as food.
An organization that has many powerful branches controlled from the centre.
An instance of a player scoring a touchdown immediately followed by a successful two-point conversion, resulting in a total score of eight points.
A safety device allowing divers to share an air supply in an emergency.

octopuses
plural of octopus

octopusses
plural of octopus

oister
Obsolete spelling of oyster.

oisters
plural of oister

oliva
olivary body

olive shells
plural of olive shell

ombrella
Obsolete form of umbrella.

ombrellas
plural of ombrella

onycholysis
The loosening or separation of a fingernail or toenail from its bed

oosporangia
plural of oosporangium

ophiomorphite
An ammonite.

oreodont
A member of the extinct genus †Oreodon or extinct superfamily †Merycoidodontoidea of ruminating hogs.

oreodonts
plural of oreodont

orientalia
Things from the Orient, especially decorative objects from eastern Asia.

ormer
An abalone or sea-ear, particularly Haliotis tuberculata, common in the Channel Islands.

ormers
plural of ormer

orthoceras
Any nautiloid cephalopod mollusc of the genus Orthoceras, known only as fossils

orthocerata
plural of orthoceras

orthoceratite
An orthoceras, or fossil shell thereof.

orthoceratites
plural of orthoceratite

ostracites
plural of ostracite

othematoma
hematoma auris; cauliflower ear

otter shell
Lutraria lutraria, a large marine bivalve mollusc.

oval squid
A type of squid with large, rounded fins resembling a cuttlefish, Sepioteuthis lessoniana.

ovula
plural of ovulum

ovulum
An ovum.
An ovule.

oyster
Any of certain marine bivalve mollusks, especially those of the family Ostreidae (the true oysters), usually found adhering to rocks or other fixed objects in shallow water along the seacoasts, or in brackish water in the mouth of rivers.
The delicate oyster-shaped morsel of dark meat contained in a small cavity of the bone on each side of the lower part of the back of a fowl.
A pale beige color tinted with grey or pink, like that of an oyster.
A person who keeps secrets.
Something at one's disposal.
A shoplifter.
Ellipsis of Oyster card.

oyster drill
A sea snail, including Urosalpinx cinerea and others in subfamily Ocenebrinae, such as genera Urosalpinx, Eupleura, and Ocenebra), that feeds on oysters and other shellfish, using an eversible gland to soften its prey's shell so that it can make a hole in the shell using its radula and consume the flesh.

oysterage
Synonym of oyster bed.

oysterages
plural of oysterage

oysterbed
Alternative spelling of oyster bed.

oysterbeds
plural of oysterbed

oysters
plural of oyster

oystre
Obsolete form of oyster.

oystres
plural of oystre

pachydermia
Elephantiasis.
Increased resistance of the red cells in anemia.

paddlecocks
plural of paddlecock

palabras
plural of palabra

palisander
rosewood

pallia
plural of pallium

pallium
A large cloak worn by Greek philosophers and teachers.
A woolen liturgical vestment resembling a collar and worn over the chasuble in the Western Christian liturgical tradition, conferred on archbishops by the Pope, equivalent to the Eastern Christian omophorion.
The mantle of a mollusc.
The cerebral cortex.
A presumed gelatinous envelope of diatoms.
A sheet of cloud covering the whole sky, especially nimbostratus.

palliums
plural of pallium

paludina
Any of numerous species of freshwater pectinibranchiate mollusks, belonging to Viviparus (syn. Paludina), Melantho, and allied genera in family Viviparidae, with operculated shells, usually green, often with brown bands.

paludinae
plural of paludina

paludinas
plural of paludina

panagiarion
A paten on which the loaf is placed, used in the 'elevation of the Panagia'.

pandoras
plural of pandora

panenka
Alternative form of Panenka.

panenkas
plural of panenka

paper nautilus
A pelagic octopus of genus Argonauta, found in warm seas, whose females produce a paper-thin egg case resembling a shell into which she deposits her eggs.

paper nautiluses
plural of paper nautilus

parachromatoblepsia
Synonym of parachromatopsia.

paramita
perfection or culmination of certain virtues

paramitas
plural of paramita

paranomia
Verbal paraphasia, an aspect of aphasia, where the patient speaks a word different from the one they intended to say.

paranomias
plural of paranomia

parapluie
An umbrella.

parapluies
plural of parapluie

paraptera
plural of parapterum
plural of parapteron

paregmena
plural of paregmenon

paregmenon
The juxtaposition of words that have the same roots; using cognate words together, such as "curvaceous curves", "my loving and beloved wife", or "he's a manly man".

partula
Any of the Polynesian tree snails of the genus Partula, family Partulidae.

partulas
plural of partula

parwannas
plural of parwanna

patela
Alternative spelling of putelee.

patelas
plural of patela

patella
The sesamoid bone of the knee; the kneecap.
A little dish or vase.
An orbicular sessile apothecium, with a marginal rim distinct from the thallus.

patellae
plural of patella

patellas
plural of patella