| acarus | (noun) any of several mites of the order Acarina | Synonyms: genus Acarus |
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| adenovirus | (noun) any of a group of viruses including those that in humans cause upper respiratory infections or infectious pinkeye | - |
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| allosaurus | (noun) late Jurassic carnivorous dinosaur; similar to but somewhat smaller than tyrannosaurus | Synonyms: allosaur |
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| alphavirus | (noun) an arbovirus of the family Togaviridae that can cause a variety of encephalitis in horses | - |
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| anestrus | (noun) applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus | Synonyms: anestrum, anoestrum, anoestrus |
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| ankylosaurus | (noun) having the back covered with thick bony plates; thought to have walked with a sprawling gait resembling a lizard's | Synonyms: ankylosaur |
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| anoestrus | (noun) applies to nonhuman mammals: a state or interval of sexual inactivity between two periods of estrus | Synonyms: anestrum, anestrus, anoestrum |
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| apatosaurus | (noun) huge quadrupedal herbivorous dinosaur common in North America in the late Jurassic | Synonyms: apatosaur, Apatosaurus excelsus, brontosaur, brontosaurus, thunder lizard |
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| arborvirus | (noun) a large heterogeneous group of RNA viruses divisible into groups on the basis of the virions; they have been recovered from arthropods, bats, and rodents; most are borne by arthropods; they are linked by the epidemiologic concept of transmission between vertebrate hosts by arthropod vectors (mosquitoes, ticks, sandflies, midges, etc.) that feed on blood; they can cause mild fevers, hepatitis, hemorrhagic fever, and encephalitis | Synonyms: arbovirus |
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| arbovirus | (noun) a large heterogeneous group of RNA viruses divisible into groups on the basis of the virions; they have been recovered from arthropods, bats, and rodents; most are borne by arthropods; they are linked by the epidemiologic concept of transmission between vertebrate hosts by arthropod vectors (mosquitoes, ticks, sandflies, midges, etc.) that feed on blood; they can cause mild fevers, hepatitis, hemorrhagic fever, and encephalitis | Synonyms: arborvirus |
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| arenavirus | (noun) animal viruses belonging to the family Arenaviridae | - |
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| barosaurus | (noun) a dinosaur that could grow to be as tall as a building five stories tall | Synonyms: barosaur |
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| brontosaurus | (noun) huge quadrupedal herbivorous dinosaur common in North America in the late Jurassic | Synonyms: apatosaur, apatosaurus, Apatosaurus excelsus, brontosaur, thunder lizard |
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| bunyavirus | (noun) an animal virus belonging to the family Bunyaviridae; can be used as a bioweapon | - |
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| ceratosaurus | (noun) primitive medium-sized theropod; swift-running bipedal carnivorous dinosaur having grasping hands with sharp claws and a short horn between the nostrils; Jurassic in North America | Synonyms: ceratosaur |
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| chorus | (noun) the part of a song where a soloist is joined by a group of singers | Synonyms: refrain |
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| (noun) any utterance produced simultaneously by a group | - |
| (noun) a group of people assembled to sing together | - |
| (noun) a body of dancers or singers who perform together | Synonyms: chorus line |
| (noun) a company of actors who comment (by speaking or singing in unison) on the action in a classical Greek play | Synonyms: Greek chorus |
| (verb) utter in unison | - |
| (verb) sing in a choir | Synonyms: choir |
| cirrus | (noun) a slender flexible animal appendage as on barnacles or crinoids or many insects; often tactile | - |
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| (noun) a wispy white cloud (usually of fine ice crystals) at a high altitude (4 to 8 miles) | Synonyms: cirrus cloud |
| (noun) usually coiled | Synonyms: cirrhus |
| citrus | (noun) any of numerous fruits of the genus Citrus having thick rind and juicy pulp; grown in warm regions | Synonyms: citrous fruit, citrus fruit |
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| (noun) any of numerous tropical usually thorny evergreen trees of the genus Citrus having leathery evergreen leaves and widely cultivated for their juicy edible fruits having leathery aromatic rinds | Synonyms: citrus tree |
| corchorus | (noun) any of various plants of the genus Corchorus having large leaves and cymose clusters of yellow flowers; a source of jute | - |
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| coronavirus | (noun) a viral disease caused by SARS-CoV-2 that caused a global pandemic in 2020 | Synonyms: 2019-nCoV acute respiratory disease, corona, coronavirus disease 2019, COVID-19, novel coronavirus pneumonia, Wuhan coronavirus, Wuhan flu, Wuhan pneumonia, Wuhan virus |
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| corythosaurus | (noun) duck-billed dinosaur with nasal passages that expand into a crest like a hollow helmet | Synonyms: corythosaur |
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| coxsackievirus | (noun) enterovirus causing a disease resembling poliomyelitis but without paralysis | Synonyms: Coxsackie virus |
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| crus | (noun) the leg from the knee to foot | - |
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| cytomegalovirus | (noun) any of a group of herpes viruses that enlarge epithelial cells and can cause birth defects; can affect humans with impaired immunological systems | Synonyms: CMV |
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| deinocheirus | (noun) lightly built medium-sized theropod with long limbs and neck | - |
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| diestrus | (noun) (of animals having several estrous cycles in one breeding season) a state or interval of sexual inactivity or quiescence between periods of activity | Synonyms: diestrum |
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| echovirus | (noun) any of a group of viruses associated with various diseases including viral meningitis and mild respiratory disorders and diarrhea in newborn infants | - |
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| edaphosaurus | (noun) heavy-bodied reptile with a dorsal sail or crest; of the late Paleozoic | - |
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| edmontosaurus | (noun) duck-billed dinosaur from Canada found as a fossilized mummy with skin | - |
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| electrophorus | (noun) a simple electrostatic generator that generates repeated charges of static electricity | - |
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| enterovirus | (noun) any of a group of picornaviruses that infect the gastrointestinal tract and can spread to other areas (especially the nervous system) | - |
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| estrus | (noun) applies to nonhuman mammals: a state or period of heightened sexual arousal and activity | Synonyms: heat, oestrus, rut |
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| filovirus | (noun) animal viruses belonging to the family Filoviridae | - |
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| flavivirus | (noun) animal viruses belonging to the family Flaviviridae | - |
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| gyrus | (noun) a convex fold or elevation in the surface of the brain | Synonyms: convolution |
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| hadrosaurus | (noun) any of numerous large bipedal ornithischian dinosaurs having a horny duck-like bill and webbed feet; may have been partly aquatic | Synonyms: duck-billed dinosaur, hadrosaur |
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| hepadnavirus | (noun) a group of animal DNA viruses including viruses of ducks and woodchucks and squirrels and others as well as the virus causing hepatitis B in humans | - |
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| herrerasaurus | (noun) a kind of theropod dinosaur found in Argentina | Synonyms: herrerasaur |
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| humerus | (noun) bone extending from the shoulder to the elbow | - |
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| ichthyosaurus | (noun) ichthyosaurs of the Jurassic | - |
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| icterus | (noun) yellowing of the skin and the whites of the eyes caused by an accumulation of bile pigment (bilirubin) in the blood; can be a symptom of gallstones or liver infection or anemia | Synonyms: jaundice |
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| kernicterus | (noun) an abnormal accumulation of bile pigment in the brain and other nerve tissue; causes yellow staining and tissue damage | - |
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| kurus | (noun) 100 kurus equal 1 lira in Turkey | Synonyms: piaster, piastre |
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| lyssavirus | (noun) a neurotropic non-arbovirus of the family Rhabdoviridae that causes rabies | - |
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| megalosaurus | (noun) gigantic carnivorous bipedal dinosaur of the Jurassic or early Cretaceous in Europe | Synonyms: megalosaur |
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| myxovirus | (noun) any of a group of RNA viruses including those that cause influenza and mumps | - |
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| oestrus | (noun) applies to nonhuman mammals: a state or period of heightened sexual arousal and activity | Synonyms: estrus, heat, rut |
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| orthomyxovirus | (noun) a group of viruses including those causing influenza | - |
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| pachycephalosaurus | (noun) bipedal herbivore having 10 inches of bone atop its head; largest boneheaded dinosaur ever found | Synonyms: pachycephalosaur |
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| papovavirus | (noun) any of a group of animal viruses associated with or causing papillomas or polyomas | - |
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| papyrus | (noun) a document written on papyrus | - |
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| (noun) tall sedge of the Nile valley yielding fiber that served many purposes in historic times | Synonyms: Cyperus papyrus, Egyptian paper reed, Egyptian paper rush, paper plant, paper rush |
| (noun) paper made from the papyrus plant by cutting it in strips and pressing it flat; used by ancient Egyptians and Greeks and Romans | - |
| paramyxovirus | (noun) a group of viruses including those causing mumps and measles | - |
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| parvovirus | (noun) any of a group of viruses containing DNA in an icosahedral protein shell and causing disease in dogs and cattle; not known to be associated with any human disease | Synonyms: parvo |
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| phosphorus | (noun) a multivalent nonmetallic element of the nitrogen family that occurs commonly in inorganic phosphate rocks and as organic phosphates in all living cells; is highly reactive and occurs in several allotropic forms | Synonyms: atomic number 15, P |
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| picornavirus | (noun) a group of single-strand RNA viruses with a protein coat | - |
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| pisanosaurus | (noun) primitive dinosaur found in Argentina | Synonyms: pisanosaur |
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| plesiosaurus | (noun) extinct marine reptile with a small head on a long neck and a short tail and four paddle-shaped limbs; of the Jurassic and Cretaceous | Synonyms: plesiosaur |
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| poliovirus | (noun) the virus causing poliomyelitis | - |
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| poxvirus | (noun) any of a group of viruses that can cause pox diseases in vertebrates | - |
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| provirus | (noun) cDNA copy of the RNA genome of a retrovirus; the genetic material of a virus as incorporated into and able to replicate with the genome of a host cell | - |
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| psittacosaurus | (noun) primitive dinosaur actually lacking horns and having only the beginning of a frill; long hind limbs and short forelimbs; may have been bipedal | Synonyms: psittacosaur |
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| pylorus | (noun) a small circular opening between the stomach and the duodenum | - |
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| reovirus | (noun) any of a group of non-arboviruses including the rotavirus causing infant enteritis | - |
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| retrovirus | (noun) any of a group of viruses that contain two single-strand linear RNA molecules per virion and reverse transcriptase (RNA to DNA); the virus transcribes its RNA into a cDNA provirus that is then incorporated into the host cell | - |
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| rhabdovirus | (noun) any of a group of arboviruses including those causing rabies | - |
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| rhinovirus | (noun) any of a group of picornaviruses that are responsible for many upper respiratory infections | - |
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| rotavirus | (noun) the reovirus causing infant enteritis | - |
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| sorus | (noun) cluster of sporangia usually on underside of a fern frond | - |
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| (noun) a spore-producing structure in certain lichens and fungi | - |
| staurikosaurus | (noun) primitive dinosaur found in Brazil | Synonyms: staurikosaur |
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| stegosaurus | (noun) herbivorous ornithischian dinosaur with a row of bony plates along its back and a spiked tail probably used as a weapon | Synonyms: stegosaur, Stegosaur stenops |
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| styracosaurus | (noun) an unusual ceratopsian dinosaur having many large spikes around the edge of its bony frill and a long nose horn; late Cretaceous | Synonyms: styracosaur |
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| susurrus | (noun) the indistinct sound of people whispering | Synonyms: susurration |
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| thesaurus | (noun) a book containing a classified list of synonyms | Synonyms: synonym finder |
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| torus | (noun) commonly the lowest molding at the base of a column | Synonyms: tore |
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| (noun) a ring-shaped surface generated by rotating a circle around an axis that does not intersect the circle | Synonyms: toroid |
| tyrannosaurus | (noun) large carnivorous bipedal dinosaur having enormous teeth with knifelike serrations; may have been a scavenger rather than an active predator; later Cretaceous period in North America | Synonyms: tyrannosaur, Tyrannosaurus rex |
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| urus | (noun) large recently extinct long-horned European wild ox; considered one of the ancestors of domestic cattle | Synonyms: aurochs, Bos primigenius |
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| uterus | (noun) a hollow muscular organ in the pelvic cavity of females; contains the developing fetus | Synonyms: womb |
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| varus | (noun) a deformity in which part of a limb is turned inward to an abnormal degree | - |
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| vesiculovirus | (noun) an animal virus that causes vesicular stomatitis | - |
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| virus | (noun) (virology) ultramicroscopic infectious agent that replicates itself only within cells of living hosts; many are pathogenic; a piece of nucleic acid (DNA or RNA) wrapped in a thin coat of protein | - |
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| (noun) a software program capable of reproducing itself and usually capable of causing great harm to files or other programs on the same computer | Synonyms: computer virus |
| (noun) a harmful or corrupting agency | - |
| walrus | (noun) either of two large northern marine mammals having ivory tusks and tough hide over thick blubber | Synonyms: sea horse, seahorse |
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