mottled rustic
A moth, Caradrina morpheus.

mottled umber
A geometrid moth, Erannis defoliaria, found throughout much of the Palearctic region.

mountain blue
Blue carbonate of copper; azurite.

mountain clouded yellow
Colias phicomone, a pierid butterfly found in various mountain ranges.

mountain ringlet
A dark brown butterfly with a row of small orange eyespots, Erebia epiphron, of the family Nymphalidae.

mourning cloak
A dark cloak worn by a mourner at a funeral.
A large butterfly, Nymphalis antiopa, native to Eurasia and North America.

mudbrick
Adobe brick; unfired brick made from mud or clay mixed with straw.

mudbricks
plural of mudbrick

myocomma
A myotome

myocommas
plural of myocomma

myocommata
plural of myocomma

myrmillo
Alternative form of mirmillo.

myrmillones
plural of myrmillo

myrmillos
plural of myrmillo

myrteta
plural of myrtetum

nan
Synonym of maid: a servant girl.
Synonym of nancy: an effeminate male homosexual.
Synonym of nursemaid.
Synonym of grandmother.

nana
A banana.
A foolish person.

nanna
grandmother

nannas
plural of nanna

nanobrick
A nanoscale brick (rectangular block)

nanobricks
plural of nanobrick

nanoclays
plural of nanoclay

nanopatch
A nanoscale patch

nanopatches
plural of nanopatch

narrow-banded dartwhite
A butterfly, Catasticta flisa postaurea

navy blue
A dark blue color.

nebula
A cloud in outer space consisting of gas or dust (e.g. a cloud formed after a star explodes).
A white spot or slight opacity of the cornea.
A cloudy appearance in the urine.

nebulae
plural of nebula

nebulas
plural of nebula

nectaria
plural of nectarium

neostigmata
Secondary tracheal openings in mites.

neovolcanites
plural of neovolcanite

nettle-tap
Certain moths of the family Choreutidae such as Anthophila fabriciana (syn. Simaethis fabriciana), Prochoreutis myllerana (syn. Simaethis myllerana), and Choreutis pariana (syn.Simaethis pariana)

neurasthenia
An ill-defined medical condition characterized by lassitude, fatigue, headache, and irritability, associated chiefly with emotional disturbance.

neurasthenias
plural of neurasthenia

neurilemmomas
plural of neurilemmoma

neurilemomas
plural of neurilemoma

neurolemmomas
plural of neurolemmoma

neuropsych
neuropsychology
neuropsychologist

nites
plural of nite

nocturesis
Nocturnal enuresis: involuntary urination (urinary incontinence) at night, especially during sleep.
Nocturia (urinary frequency and/or urgency at night, prompting awakening and trips to the toilet).

nola
A very small bell used in the choir during consecration.

nonconformist
A member of a church separated from the Church of England; a Protestant dissenter.
Loosely, a Christian who does not conform to the doctrines of an established church.
Someone who does not conform to accepted beliefs, customs or practices.
A noctuid moth (Lithophane lamda).

nonconformists
plural of nonconformist

nonconformitan
nonconformist

nonconformitans
plural of nonconformitan

nonconformitant
nonconformist

nonplush
nonplus

norma
A norm.
A template.
A square for measuring right angles.

normas
plural of norma

northern brown argus
Aricia artaxerxes, a species of brown butterfly.

nov
A novice.

novice
A beginner; one who is not very familiar or experienced in a particular subject.
A new member of a religious order accepted on a conditional basis, prior to confirmation.

novices
plural of novice

novs
plural of nov

nucleofractis
damage to the nucleus (of the eye) during surgery

nun
A member of a Christian religious community of women who live by certain vows and usually wear a habit, (Roman Catholicism, specifically) those living together in a cloister.
A member of a similar female community in other confessions.
A prostitute.
A kind of pigeon with the feathers on its head like the hood of a nun.

nuns
plural of nun

nuplexes
plural of nuplex

nutmeg
An evergreen tree (Myristica fragrans) cultivated in the East Indies for its spicy seeds.
The aromatic seed of this tree, used as a spice.
The aromatic seed of this tree, used as a spice.
A small moth, Hadula trifolii, feeding on plants and native to the Northern Hemisphere.
A grey-brown colour.
The playing of the ball between the legs of an opponent.

nutmegg
Obsolete spelling of nutmeg.

nutmeggs
plural of nutmegg

nutmegs
plural of nutmeg

nuzzerana
Alternative form of nazarana.

nygma
A spot on the wings of certain endopterygotes, having a peculiar dense cuticular structure, and of uncertain function.

nygmata
plural of nygma

nympha
A nymph.
Each of the labia minora.
Each of a pair of processes in certain bivalves, to which the ends of the external ligament are attached.

nymphae
plural of nymph
plural of nympha
plural of nymphe

nymphalids
plural of nymphalid

oar
A type of lever used to propel a boat, having a flat blade at one end and a handle at the other, and pivoted in a rowlock atop the gunwale, whereby a rower seated in the boat and pulling the handle can pass the blade through the water by repeated strokes against the water's resistance, thus moving the boat.
An oarsman; a rower.
An oar-like swimming organ of various invertebrates.

oarblade
Alternative form of oar blade.

oarblades
plural of oarblade

oare
Obsolete spelling of oar.

oares
plural of oare

oars
plural of oar

ocha
Japanese tea, usually green tea.

ockerina
Synonym of ockerette.

ockerinas
plural of ockerina

octathletes
plural of octathlete

odontodes
plural of odontode

ohzee
Alternative form of OZ (“ounce”).

ohzees
plural of ohzee

oilpatch
A patch or puddle of oil.
An oil and gas producing region; (metonymic) the oil and gas industry.

oilpatches
plural of oilpatch

old lady
An elderly woman.
One's mother.
One's girlfriend, wife or female significant other.
The Bank of England, sometimes referred to as the “Old Lady of Threadneedle Street” or simply “The Old Lady”.
A queen.

oleander moth
Synonym of polka-dot wasp moth (“Syntomeida epilais”).

oligoduplex
A double-stranded oligonucleotide

oligoduplexes
plural of oligoduplex

oligophrenia
subnormal mental development

oligophrenias
plural of oligophrenia

oligophreny
Alternative form of oligophrenia.

olive moth
A European moth of species Prays oleae.

olona
The flowering plant Touchardia latifolia, endemic to Hawaii.

omphalopsychites
plural of omphalopsychite

ophthalmia
Synonym of ophthalmitis (“inflammation of the eye”).

ophthalmias
plural of ophthalmia

ophthalmies
plural of ophthalmy

ophthalmitis
Severe conjunctivitis (inflammation of the conjunctiva).

ophthalmy
Archaic form of ophthalmia.

orache moth
Trachea atriplicis, a species of moth.

orange dog
The caterpillar of the giant swallowtail butterfly, which feeds on the leaves of citrus.

orange ringlet
A species of satyrine butterfly with orange wings, Hypocysta adiante, endemic to northern Australia.

orange swift
A moth of species Triodia sylvina, found in Europe.

orange tip
Any of various pierid butterflies having orange tips to the upper forewings, especially Anthocharis cardamines, of Eurasia.

orangetips
plural of orangetip

orderites
plural of orderite

organistra
plural of organistrum

orthocupolarotunda
A cupolarotunda in which the bases have the same orientation.

orthodoxia
Correct praise; correct faith.

orthogonia
plural of orthogonium

orthopraxes
plural of orthopraxis

orthopraxis
orthopraxy

outbrother
An outpensioner.

outbrothers
plural of outbrother

outwalls
plural of outwall

owl moth
Any of various moths, mainly brahmaeids, but also Anticarsia irrorata, Cometaster pyrula, Thysania agrippina , and Thysania zenobia.

owlet moth
Any moth of the family Noctuidae.

owlet moths
plural of owlet moth

oz
Abbreviation of ounce; any of various units of weight and volume.

ozs
plural of oz; ounces

pachymeninges
plural of pachymeninx

pachymeninx
Synonym of dura mater.

paidia
Free play, such as make-believe, that lacks the structured rules of formal games.

painted beauty
Batesia hypochlora, a colourful American butterfly.