aquadag
A waterbased colloidal graphite coating commonly used in cathode ray tubes.

aquafauna
aquatic animals considered as a group

aquaria
plural of aquarium

aquarium
A tank, often made of glass, for keeping live fish or other aquatic animals.
A public place where live fish and other aquatic animals are exhibited.

aquariums
plural of aquarium

aquaterrarium
A terrarium for the display of aquatic plants.

aquaterrariums
plural of aquaterrarium

aquavina
Alternative form of aguavina (“kind of fish”).

aquavinas
plural of aquavina

aquilino
An old Italian coin bearing the image of an eagle.

aquilinos
plural of aquilino

araara
trevally, a kind of fish

aracanga
The scarlet macaw.

aracangas
plural of aracanga

aracanid
Any member of the family Aracanidae of fish similar to boxfishes.

aracanids
plural of aracanid

arachnidan
arachnid (any of the Arachnida).

arachnidans
plural of arachnidan

arachnidium
The collective abdominal appendages from which a spider produces a web or silk.

aradid
Any member of the family Aradidae, the flat bugs.

aradids
plural of aradid

araguato
A South American howler monkey, the ursine howler (Alouatta arctoidea).

araguatos
plural of araguato

arahuana
Alternative form of arowana (“type of fish”).

arandaspid
A member of the extinct class Arandaspidiformes of jawless fish that lived in the Ordovician.

araneid
A spider; now specifically a member of the family Araneidae; an orb weaver.

araneidan
Any spider

araneidans
plural of araneidan

araneids
plural of araneid

araneoid
Any spider of the superfamily Araneoidea.

araneoids
plural of araneoid

araneology
The study of the spider, a branch of arachnology.

araneomorph
Any of the Araneomorphae, a suborder of spiders whose fangs cross with a pinching action.

araneomorphs
plural of araneomorph

araneophage
Any araneophagous organism.

araneophages
plural of araneophage

aranga
Among Siberian peoples, a platform on which the body of a deceased human, usually a shaman (or his horse), is placed, as a form of sky burial.

arangas
plural of aranga

aranology
Alternative form of araneology.

arapaima
Any large, bonytongue fish in the genus Arapaima, native to the Amazon and Essequibo basins of South America.
Any large, bonytongue fish in the genus Arapaima, native to the Amazon and Essequibo basins of South America.

arapaimas
plural of arapaima

araphid
Any pennate diatom that lacks raphes

ararauna
A blue-and-yellow macaw (Ara ararauna).

araraunas
plural of ararauna

arawana
Alternative form of arowana (“type of fish”).

arawanas
plural of arawana

archaebacteria
plural of archaebacterium

archaebacterium
Any primitive bacteria-like organism in the kingdom Archaea.

archaeid
Any member of the family Archaeidae of spiders, of southern Africa, Madagascar, and Australia.

archaeids
plural of archaeid

archaeobalanid
Any member of the family Archaeobalanidae, stalkless acorn barnacles in the order Sessilia.

archaeobalanids
plural of archaeobalanid

archaeobatrachian
Any primitive frog or toad of the suborder Archaeobatrachia.

archaeobatrachians
plural of archaeobatrachian

archaeocyath
Any of the taxon †Archaeocyatha of marine sponges.

archaeocyathan
Synonym of archaeocyathid.

archaeocyathans
plural of archaeocyathan

archaeocyathid
Any of the clade †Archaeocyatha of marine sponges.

archaeocyathids
plural of archaeocyathid

archaeocyaths
plural of archaeocyath

archaeofauna
The animal remains found at an archaeological site
prehistoric animals

archaeofaunas
plural of archaeofauna

archaeogastropod
Any member of the order Archaeogastropoda, of sea snails.

archaeogastropods
plural of archaeogastropod

archaeohyracid
Any of the extinct mammals of the family Archaeohyracidae.

archaeohyracids
plural of archaeohyracid

archaeome
All the archaea (or their descendants) in an organism

archaeomes
plural of archaeome

archaeon
A prokaryotic organism; a member of the domain Archaea

archaeons
plural of archaeon

archaeonycteridid
Any of the extinct bats in the family Archaeonycterididae.

archaeonycteridids
plural of archaeonycteridid

archaeopterygid
Any member of the family †Archaeopterygidae of fossil birds.

archaeopterygids
plural of archaeopterygid

archaeorthopteran
Any insect of the superorder Archaeorthoptera

archaeorthopterans
plural of archaeorthopteran

archaeozoology
The study of relationships between humans and animals over time.

archaeozoon
Any animal known only from archaeological evidence

archaeozoons
plural of archaeozoon

archasterid
Any starfish in the family Archasteridae.

archasterids
plural of archasterid

archeabacteria
plural of archeabacterium

archeabacterium
Alternative form of archaebacterium.

archebacteria
plural of archebacterium

archebacterium
Alternative spelling of archaebacterium.

archegosaurid
Any of the extinct amphibian-like vertebrates in the family Archegosauridae.

archegosaurids
plural of archegosaurid

archeobatrachian
Alternative form of archaeobatrachian.

archeobatrachians
plural of archeobatrachian

archeocyathan
Alternative form of archaeocyathan.

archeon
Alternative spelling of archaeon.

archeons
plural of archeon

archeozoology
Alternative spelling of archaeozoology.

archerfish
Any of the species of fish in the family Toxotidae (usually with sole genus Toxotes), who prey on small animals near to the surface of a water by shooting them with water from their mouths.

archerfishes
plural of archerfish

archeriid
Any of the extinct amphibian-like vertebrates in the family Archeriidae.

archeriids
plural of archeriid

archgovernor
A chief governor.

archgovernors
plural of archgovernor

archiannelid
Any member of the class Archiannelida of primitive marine worms.

archiannelids
plural of archiannelid

archimollusc
A hypothetical primitive mollusc representing the MRCA of the Mollusca.

archimollusk
Alternative spelling of archimollusc.

archipterygia
plural of archipterygium

archipterygium
A primitive fin, like that of Ceratodus.

architeuthid
A giant squid, of the family Architeuthidae.

architeuthids
plural of architeuthid

archnemeses
plural of archnemesis

archnemesis
A chief nemesis.

archosauriforms
plural of archosauriform

archosauromorph
Any lizard of the extinct infraclass †Archosauromorpha.

archosauromorphs
plural of archosauromorph

archpaladin
A supreme paladin.

archpaladins
plural of archpaladin

arcoid
Any bivalve mollusc of the superfamily Arcoidea

arcoids
plural of arcoid

arctic grayling
Synonym of grayling (“Thymallus arcticus”)

arcticid
Any clam in the family Arcticidae, all but one species of which are extinct.

arcticids
plural of arcticid

arctiid
Any member of the family Arctiidae of moths.

arctiids
plural of arctiid

arctocyonid
Any member of the family †Arctocyonidae of extinct carnivores.

arctocyonids
plural of arctocyonid

ardeid
Any member of the family Ardeidae, the herons, egrets and bitterns.

ardeids
plural of ardeid

arecid
Any member of the subclass Arecidae of certain monocots, such as palms.

arecids
plural of arecid

areneomorph
Any spider of the infraorder Araneomorphae

areneomorphs
plural of areneomorph

arenicolid
Any of the polychete worms in the family Arenicolidae.

arenicolids
plural of arenicolid

argala
The greater adjutant, a stork native to Africa, India, and Southeast Asia.

argalas
plural of argala

argasid
Any of various ticks of the family Argasidae.

argasids
plural of argasid

argentines
plural of argentine

argentinid
Any member of the family Argentinidae of herring smelts.

argentinids
plural of argentinid

argid
Any member of the Argidae.

argids
plural of argid

argonaut
Any of several species of shelled octopods of the family Argonautidae (of which only the genus Argonauta is not extinct).
An adventurer on a dangerous but rewarding quest.
A 49er, a person who took part in the California Gold Rush of 1849.

argonautid
Any member of the Argonautidae.

argonautids
plural of argonautid

argonautoid
Any member of the Argonautoidea superfamily of cephalopods.