| actinozoan | (noun) sessile marine coelenterates including solitary and colonial polyps; the medusoid phase is entirely suppressed | Synonyms: anthozoan |
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| anthozoan | (noun) sessile marine coelenterates including solitary and colonial polyps; the medusoid phase is entirely suppressed | Synonyms: actinozoan |
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| bryozoan | (noun) sessile aquatic animal forming mossy colonies of small polyps each having a curved or circular ridge bearing tentacles; attach to stones or seaweed and reproduce by budding | Synonyms: moss animal, polyzoan, sea mat, sea moss |
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| ectozoan | (noun) any external parasitic organism (as fleas) | Synonyms: ectoparasite, ectozoon, epizoan, epizoon |
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| endozoan | (noun) any of various parasites that live in the internal organs of animals (especially intestinal worms) | Synonyms: endoparasite, entoparasite, entozoan, entozoon |
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| entozoan | (noun) any of various parasites that live in the internal organs of animals (especially intestinal worms) | Synonyms: endoparasite, endozoan, entoparasite, entozoon |
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| epizoan | (noun) any external parasitic organism (as fleas) | Synonyms: ectoparasite, ectozoan, ectozoon, epizoon |
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| groan | (noun) an utterance expressing pain or disapproval | Synonyms: moan |
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| heliozoan | (noun) protozoa with spherical bodies and stiff radiating pseudopods | - |
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| hydrozoan | (noun) colonial coelenterates having the polyp phase dominant | Synonyms: hydroid |
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| koan | (noun) a paradoxical anecdote or a riddle that has no solution; used in Zen Buddhism to show the inadequacy of logical reasoning | - |
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| leucocytozoan | (noun) parasitic in birds | Synonyms: leucocytozoon |
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| loan | (noun) a word borrowed from another language; e.g. `blitz' is a German word borrowed into modern English | Synonyms: loanword |
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| (noun) the temporary provision of money (usually at interest) | - |
| metazoan | (noun) any animal of the subkingdom Metazoa; all animals except protozoans and sponges | - |
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| moan | (noun) an utterance expressing pain or disapproval | Synonyms: groan |
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| parazoan | (noun) primitive multicellular marine animal whose porous body is supported by a fibrous skeletal framework; usually occurs in sessile colonies | Synonyms: poriferan, sponge |
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| polyzoan | (noun) sessile aquatic animal forming mossy colonies of small polyps each having a curved or circular ridge bearing tentacles; attach to stones or seaweed and reproduce by budding | Synonyms: bryozoan, moss animal, sea mat, sea moss |
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| protozoan | (noun) any of diverse minute acellular or unicellular organisms usually nonphotosynthetic | Synonyms: protozoon |
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| roan | (noun) a horse having a brownish coat thickly sprinkled with white or gray | - |
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| (noun) a soft sheepskin leather that is colored and finished to resemble morocco; used in bookbinding | - |
| scyphozoan | (noun) any of various usually free-swimming marine coelenterates having a gelatinous medusoid stage as the dominant phase of its life cycle | - |
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| spermatozoan | (noun) the male reproductive cell; the male gamete | Synonyms: sperm, sperm cell, spermatozoon |
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| sporozoan | (noun) parasitic spore-forming protozoan | - |
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