| bazooka | (noun) a portable rocket launcher used by infantrymen as an antitank weapon | - |
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| ectozoon | (noun) any external parasitic organism (as fleas) | Synonyms: ectoparasite, ectozoan, epizoan, epizoon |
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| entozoon | (noun) any of various parasites that live in the internal organs of animals (especially intestinal worms) | Synonyms: endoparasite, endozoan, entoparasite, entozoan |
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| epizoon | (noun) any external parasitic organism (as fleas) | Synonyms: ectoparasite, ectozoan, ectozoon, epizoan |
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| kazoo | (noun) a toy wind instrument that has a membrane that makes a sound when you hum into the mouthpiece | - |
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| leucocytozoon | (noun) parasitic in birds | Synonyms: leucocytozoan |
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| palaeozoology | (noun) the study of fossil animals | Synonyms: paleozoology |
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| paleozoology | (noun) the study of fossil animals | Synonyms: palaeozoology |
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| protozoologist | (noun) a zoologist who studies protozoans | - |
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| protozoology | (noun) the branch of zoology that studies protozoans | - |
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| protozoon | (noun) any of diverse minute acellular or unicellular organisms usually nonphotosynthetic | Synonyms: protozoan |
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| spermatozoon | (noun) the male reproductive cell; the male gamete | Synonyms: sperm, sperm cell, spermatozoan |
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| zoo | (noun) the facility where wild animals are housed for exhibition | Synonyms: menagerie, zoological garden |
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| zooecdysone | (noun) The term 'zooecdysone' refers to the molting hormones of insects. | - |
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| zooerastia | (noun) sexual activity between a person and an animal | Synonyms: bestiality, sodomy, zooerasty |
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| zooerasty | (noun) sexual activity between a person and an animal | Synonyms: bestiality, sodomy, zooerastia |
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| zooflagellate | (noun) flagellate protozoan lacking photosynthesis and other plant-like characteristics | Synonyms: zoomastigote |
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| zooid | (noun) one of the distinct individuals forming a colonial animal such as a bryozoan or hydrozoan | - |
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| zoolatry | (noun) the worship of animals | Synonyms: animal-worship |
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| zoologist | (noun) a specialist in the branch of biology dealing with animals | Synonyms: animal scientist |
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| zoology | (noun) the branch of biology that studies animals | Synonyms: zoological science |
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| (noun) all the animal life in a particular region or period | Synonyms: fauna |
| zoom | (noun) the act of rising upward into the air | Synonyms: soar |
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| (noun) a rapid rise | Synonyms: rapid climb, rapid growth |
| zoomastigote | (noun) flagellate protozoan lacking photosynthesis and other plant-like characteristics | Synonyms: zooflagellate |
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| zoomorphism | (noun) the attribution of animal forms or qualities to a god | - |
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| zoonosis | (noun) an animal disease that can be transmitted to humans | Synonyms: zoonotic disease |
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| zoophagy | (noun) The quality of being an animal that eats meat as the main part of its diet. | Synonyms: carnivorousness |
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| zoophilia | (noun) a sexual attraction to animals | Synonyms: zoophilism |
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| zoophilism | (noun) a sexual attraction to animals | Synonyms: zoophilia |
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| zoophobia | (noun) a morbid fear of animals | - |
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| zoophyte | (noun) any of various invertebrate animals resembling a plant such as a sea anemone or coral or sponge | - |
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| zooplankton | (noun) animal constituent of plankton; mainly small crustaceans and fish larvae | - |
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| zoopsia | (noun) visual hallucination of animals; sometimes occurring in delirium tremens | - |
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| zoospore | (noun) an asexual spore of some algae and fungi that moves by means of flagella | - |
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| zootoxin | (noun) a toxin resembling bacterial toxins in its antigenic properties that is found in the fluids of certain animals | Synonyms: animal toxin |
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