| autodidact | (noun) a person who has taught himself | - |
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| blastoderm | (noun) a layer of cells on the inside of the blastula | Synonyms: blastodisc, germinal area, germinal disc |
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| blastodisc | (noun) a layer of cells on the inside of the blastula | Synonyms: blastoderm, germinal area, germinal disc |
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| ceratodus | (noun) extinct lungfish | - |
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| cestode | (noun) ribbonlike flatworms that are parasitic in the intestines of humans and other vertebrates | Synonyms: tapeworm |
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| chaetodon | (noun) any fish of the genus Chaetodon | - |
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| custodian | (noun) one having charge of buildings or grounds or animals | Synonyms: keeper, steward |
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| custodianship | (noun) the position of custodian | - |
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| custody | (noun) holding by the police | - |
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| (noun) (with `in') guardianship over; in divorce cases it is the right to house and care for and discipline a child | Synonyms: hands |
| (noun) a state of being confined (usually for a short time) | Synonyms: detainment, detention, hold |
| dicamptodon | (noun) salamanders found near cold streams throughout the year | Synonyms: dicamptodontid |
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| dicamptodontid | (noun) salamanders found near cold streams throughout the year | Synonyms: dicamptodon |
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| ectoderm | (noun) the outer germ layer that develops into skin and nervous tissue | Synonyms: ectoblast, exoderm |
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| entoderm | (noun) the inner germ layer that develops into the lining of the digestive and respiratory systems | Synonyms: endoblast, endoderm, entoblast, hypoblast |
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| etodolac | (noun) a nonsteroidal anti-inflammatory drug (trade name Lodine) | Synonyms: Lodine |
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| fantods | (noun) an ill-defined state of irritability and distress | - |
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| ictodosaur | (noun) intermediate in form between the therapsids and most primitive true mammals | - |
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| keratoderma | (noun) any skin disorder consisting of a growth that appears horny | Synonyms: keratodermia |
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| keratodermia | (noun) any skin disorder consisting of a growth that appears horny | Synonyms: keratoderma |
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| leptodactylid | (noun) toothed frogs: terrestrial or aquatic or arboreal | Synonyms: leptodactylid frog |
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| mastodon | (noun) extinct elephant-like mammal that flourished worldwide from Miocene through Pleistocene times; differ from mammoths in the form of the molar teeth | Synonyms: mastodont |
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| mastodont | (noun) extinct elephant-like mammal that flourished worldwide from Miocene through Pleistocene times; differ from mammoths in the form of the molar teeth | Synonyms: mastodon |
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| nematode | (noun) unsegmented worms with elongated rounded body pointed at both ends; mostly free-living but some are parasitic | Synonyms: nematode worm, roundworm |
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| pentode | (noun) a thermionic tube having five electrodes | - |
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| stodge | (noun) heavy and filling (and usually starchy) food | - |
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| stodginess | (noun) dull and pompous gravity | Synonyms: stuffiness |
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| streptodornase | (noun) an enzyme produced by some hemolytic strains of streptococcus that dissolves fibrinous secretions from infections; used medicinally (often in combination with streptokinase) | - |
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| tod | (noun) a unit of weight for wool equal to about 28 pounds | - |
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| today | (noun) the present time or age | - |
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| (noun) the day that includes the present moment (as opposed to yesterday or tomorrow) | - |
| toddler | (noun) a young child who is just beginning to walk | Synonyms: bambino, tot, yearling |
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| toddy | (noun) a mixed drink made of liquor and water with sugar and spices and served hot | Synonyms: hot toddy |
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| tody | (noun) tiny insectivorous West Indian bird having red-and-green plumage and a long straight bill | - |
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| trematode | (noun) parasitic flatworms having external suckers for attaching to a host | Synonyms: fluke, trematode worm |
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