| anapsid | (noun) primitive reptile having no opening in the temporal region of the skull; all extinct except turtles | Synonyms: anapsid reptile |
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| argasid | (noun) tick lacking a dorsal shield and having mouth parts on the under side of the head | Synonyms: soft tick |
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| capsid | (noun) the outer covering of protein surrounding the nucleic acid of a virus | - |
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| (noun) a variety of leaf bug | Synonyms: mirid, mirid bug |
| diapsid | (noun) reptile having a pair of openings in the skull behind each eye | Synonyms: diapsid reptile |
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| jassid | (noun) a variety of leafhopper | - |
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| liliopsid | (noun) a monocotyledonous flowering plant; the stem grows by deposits on its inside | Synonyms: endogen, monocot, monocotyledon |
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| magnoliopsid | (noun) flowering plant with two cotyledons; the stem grows by deposit on its outside | Synonyms: dicot, dicotyledon, exogen |
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| resid | (noun) oil products that remain after petroleum has been distilled | Synonyms: residual oil |
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| synapsid | (noun) extinct reptile having a single pair of lateral temporal openings in the skull | Synonyms: synapsid reptile |
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| therapsid | (noun) probably warm-blooded; considered direct ancestor of mammals | Synonyms: protomammal |
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