| agamid | (noun) a lizard of the family Agamidae | Synonyms: agamid lizard |
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| ambystomid | (noun) small to moderate-sized terrestrial or semiaquatic New World salamander | Synonyms: ambystomid salamander |
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| catostomid | (noun) a cypriniform fish of the family Catostomidae | - |
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| cosmid | (noun) (genetics) a large vector that is made from a bacteriophage and used to clone genes or gene fragments | - |
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| cyanamid | (noun) a weak soluble dibasic acid (the parent acid of cyanamide salts) | Synonyms: cyanamide |
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| desmid | (noun) freshwater green algae | - |
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| humid | (adjective) containing or characterized by a great deal of water vapor | - |
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| mid | (adjective) used in combination to denote the middle | - |
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| ornithomimid | (noun) lightly built medium-sized dinosaur having extremely long limbs and necks with small heads and big brains and large eyes | - |
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| pentastomid | (noun) wormlike arthropod having two pairs of hooks at the sides of the mouth; parasitic in nasal sinuses of mammals | Synonyms: tongue worm |
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| phasmid | (noun) large cylindrical or flattened mostly tropical insects with long strong legs that feed on plants; walking sticks and leaf insects | Synonyms: phasmid insect |
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| plasmid | (noun) a small cellular inclusion consisting of a ring of DNA that is not in a chromosome but is capable of autonomous replication | Synonyms: plasmid DNA |
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| pyramid | (noun) (stock market) a series of transactions in which the speculator increases his holdings by using the rising market value of those holdings as margin for further purchases | - |
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| (noun) a polyhedron having a polygonal base and triangular sides with a common vertex | - |
| (verb) increase rapidly and progressively step by step on a broad base | - |
| (verb) arrange or build up as if on the base of a pyramid | - |
| (verb) enlarge one's holdings on an exchange on a continued rise by using paper profits as margin to buy additional amounts | - |
| (verb) use or deal in (as of stock or commercial transaction) in a pyramid deal | - |
| timid | (adjective) showing fear and lack of confidence | - |
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| (adjective) lacking self-confidence | Synonyms: diffident, shy, unsure |
| (adjective) lacking conviction or boldness or courage | Synonyms: faint-hearted, faint, fainthearted |
| (noun) people who are fearful and cautious | Synonyms: cautious |
| tumid | (adjective) of sexual organs; stiff and rigid | Synonyms: erect |
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| (adjective) ostentatiously lofty in style | Synonyms: bombastic, declamatory, large, orotund, turgid |
| (adjective) abnormally distended especially by fluids or gas | Synonyms: bloated, distended, intumescent, puffy, swollen, tumescent, turgid |