amphetamine
The racemic freebase of 1-phenylpropan-2-amine; an equal parts mixture of levoamphetamine and dextroamphetamine in their pure amine forms.
Any mixture of the two amphetamine enantiomers, dextroamphetamine and levoamphetamine.
Referring to a substituted amphetamine; a member of the amphetamine class of chemicals.
A potent central nervous system stimulant of the phenethylamine chemical class that is used to treat ADHD, narcolepsy, and obesity.

amphiaspid
Any extinct agnathan of the taxon Amphiaspidida

amphicrania
A headache affecting both sides of the head.

amphidiscophoran
Any glass sponge of the subclass Amphidiscophora

amphidiscophorans
plural of amphidiscophoran

amphiesmenopteran
Any insect of the taxon Amphiesmenoptera - including lepidopterans (butterflies and moths).

amphiesmenopterans
plural of amphiesmenopteran

amphigenesis
Sexual propagation

amphikinesis
The movement of both upper and lower parts of a bird's beak where it joins the skull.

amphiliid
Any member of the Any catfish in the family Amphiliidae.

amphiliids
plural of amphiliid

amphilinid
Any member of the Amphilinidea, an order of parasitic flatworms.

amphilinids
plural of amphilinid

amphimeriasis
A zoonotic disease of fish caused by liver flukes of the family Amphimerus

amphimict
Any amphimictic plant or organism.

amphimicts
plural of amphimict

amphinomid
Any member of the family Amphinomidae of sea mice or bristle worms.

amphinomids
plural of amphinomid

amphioxi
plural of amphioxus

amphioxus
The lancelet, particularly of the genus Branchiostoma.

amphioxuses
plural of amphioxus

amphiptere
A type of winged serpent, with two bat-like wings and typically with no other limbs.

amphipteres
plural of amphiptere

amphisbaena
A mythical serpent having a head at each end of its body, able to move in either direction.
A member of a genus of lizards, native to the Americas, having extremities which are very similar.

amphisbaenas
plural of amphisbaena

amphisteginid
Any foraminifera of the family Amphisteginidae.

amphisteginids
plural of amphisteginid

amphithecia
plural of amphithecium

amphithecium
The thalline margin of a lecanorine apothecium.
The external cell layers of the developing sporangium of a bryophyte.

amphithere
Alternative form of amphiptere.

amphitheres
plural of amphithere

amphiumid
Any member of the Amphiumidae.

amphiumids
plural of amphiumid

amplang
A kind of Indonesian savoury fish cracker.

ampulicid
Any member of the Ampulicidae.

ampulicids
plural of ampulicid

ampullariid
Any member of the Ampullariidae.

ampullariids
plural of ampullariid

ampyx
A woman's headband (sometimes of metal), for binding the front hair in Ancient Greece.

anabantid
Any member of the family Anabantidae of climbing perches.

anabantids
plural of anabantid

anabas
A fish of the genus Anabas, a kind of climbing gourami.

anableps
Synonym of four-eyed fish.

anacladogenesis
anagenetic speciation

anadrom
Any anadromous fish, a fish that lives in the sea and goes up rivers to breed in fresh water.

anadroms
plural of anadrom

anaerobe
An anaerobic organism; one that does not require oxygen to sustain its metabolic processes.

anaerobes
plural of anaerobe

anaerobia
plural of anaerobium

anaerobium
Synonym of anaerobe.

anamniote
Any vertebrate that is not an amniote; an amphibian or a fish.

anamniotes
plural of anamniote

anancies
plural of anancy

anancy
A nonpoisonous arachnid, daddy longlegs.

anapests
plural of anapest

anaphalantiasis
Hair loss from the eyebrows

anaphia
Tactile anesthesia; the total or partial absence of the sense of touch.

anaptomorphine
Any of the subfamily †Anaptomorphinae of prehistoric primate.

anaptomorphines
plural of anaptomorphine

anarhichadid
Any member of the Anarhichadidae.

anarhichadids
plural of anarhichadid

anascan
Any member of the Anasca suborder of bryozoans.

anascans
plural of anascan

anaspidean
A marine mollusc of the clade Anaspidea.

anaspideans
plural of anaspidean

anatexite
Any rock produced by anatexis

anatexites
plural of anatexite

anatid
Any member of the family Anatidae of ducks and close relatives.

anatidaephobia
The fear that one is being constantly watched by a duck.

anatids
plural of anatid

anatipestifer
Synonym of anatipestifer disease.

anberries
plural of anberry

anberry
Alternative spelling of anbury.

anburies
plural of anbury

anbury
A wen or spongy wart on the legs or flanks of a horse.
A disease in turnips, produced by one of the slime-fungi, and usually the result of improper cultivation.

anchisaurid
Any dinosaur in the family Anchisauridae.

anchisaurids
plural of anchisaurid

anchitheriine
Any member of the †Anchitheriinae, an extinct subfamily of equids.

anchitheriines
plural of anchitheriine

ancho
A broad, flat, dried poblano pepper, often ground into a powder.

anchor worm
A lernean.

anchos
plural of ancho

anchoveta
An anchovy of species Engraulis ringens, from the southern Pacific.

anchovetas
plural of anchoveta

anchovetta
Alternative spelling of anchoveta.

anchovettas
plural of anchovetta

anchovies
plural of anchovy

anchovy
Any small saltwater fish of the Engraulidae family, consisting of 160 species in sixteen genera, those of the genus Engraulis being widely sold as food.

anchovy paste
A kind of fish paste made mainly with anchovies.

ancodont
Any mammal in the infraorder Ancodonta— hippos and their extinct relatives.

ancodonts
plural of ancodont

ancon
The corner of a wall or rafter.
A console that appears to support a cornice.
The elbow.
The olecranon.

ancones
plural of ancon

ancons
plural of ancon

ancylid
Any member of the family Ancylidae, now tribe Ancylini, of certain limpets and ramshorn snails.

ancyloceratid
Any ammonite in the family Ancyloceratidae.

ancyloceratids
plural of ancyloceratid

ancyloceratin
Any member of the Ancyloceratina suborder of ammonites.

ancylocone
An organism or fossil with an ancyloconic shell, or the shell itself.

ancylocones
plural of ancylocone

ancylopod
A member of the Ancylopoda.

ancylopods
plural of ancylopod.

ancylostoma
Any hookworm of the genus Ancylostoma.

ancylostomas
plural of ancylostoma

ancylostomata
plural of ancylostoma

ancylostomatid
Any member of the family Ancylostomatidae of hookworms.

ancylostomatids
plural of ancylostomatid

ancylostome
Alternative form of ancylostoma (“type of hookworm”).

ancylostomes
plural of ancylostome

andrenid
Any member of the family Andrenidae of bees.

androgeneses
plural of androgenesis

androgenesis
Male or paternal apomixis, involving fusion of the male and female gametes and replacement of the female nucleus by the male nucleus.

androgeny
Synonym of androgenesis.
Misspelling of androgyny.

andrognathid
Any member of the Andrognathidae family of millipedes.

andromorph
An organism with male physical characteristics; male mimic.
An andromorphic person.

andromorphs
plural of andromorph

anemochore
An organism that spreads by wind, as a plant with wind-borne seeds.

anemochores
plural of anemochore

anemone fish
Alternative form of anemonefish.

anemotaxis
Movement of an organism in response to air currents.

anencephali
plural of anencephalus

anencephalus
anencephaly

anepisternum
The uppser part of the episternum of an insect.

aneuploidization
Modification of an organism such that it becomes aneuploid

aneuploidizations
plural of aneuploidization

aneusomaty
Chromosome variation within an individual organism.

angioblastoma
A tufted angioma; an ill-defined dull red macule developing usually in infancy on the neck or upper trunk.

angioblastomas
plural of angioblastoma

angioblastomata
plural of angioblastoma

angler
A person who fishes with a hook and line.
An angler fish, Lophius piscatorius.
Someone who tries to work an angle; a person who schemes or has an ulterior motive.
A thief who uses a hooked stick to steal goods out of shop-windows, grates, etc.

angler fish
Alternative spelling of anglerfish.