| adelgid | (noun) any of various insects that feed and form galls on conifers | - |
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| algid | (adjective) chilly | - |
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| caprimulgid | (noun) mainly crepuscular or nocturnal nonpasserine birds with mottled greyish-brown plumage and large eyes; feed on insects | Synonyms: goatsucker, nightjar |
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| carangid | (adjective) of or relating to fish of the family Carangidae | - |
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| (noun) a percoid fish of the family Carangidae | Synonyms: carangid fish |
| energid | (noun) a biological unit consisting of a nucleus and the body of cytoplasm with which it interacts | Synonyms: protoplast |
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| frigid | (adjective) extremely cold | Synonyms: arctic, gelid, glacial, icy, polar |
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| (adjective) devoid of warmth and cordiality; expressive of unfriendliness or disdain | Synonyms: frosty, frozen, glacial, icy, wintry |
| (adjective) sexually unresponsive | Synonyms: cold |
| fulgid | (adjective) having brief brilliant points or flashes of light | Synonyms: aglitter, coruscant, glinting, glistering, glittering, glittery, scintillant, scintillating, sparkly |
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| nonrigid | (adjective) designating an airship having a shape maintained only by internal gas pressure and without a supporting structure | - |
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| pongid | (noun) any of the large anthropoid apes of the family Pongidae | Synonyms: great ape |
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| rigid | (adjective) designating an airship or dirigible having a form maintained by a stiff unyielding frame or structure | - |
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| (adjective) incapable of or resistant to bending | Synonyms: stiff |
| (adjective) incapable of compromise or flexibility | Synonyms: strict |
| (adjective) fixed and unmoving | Synonyms: fixed, set |
| (adjective) incapable of adapting or changing to meet circumstances | Synonyms: inflexible, unbending |
| semirigid | (adjective) not fully rigid | - |
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| (adjective) having a form maintained by a rigid internal structure as well as by internal gas pressure | - |
| sphingid | (noun) any of various moths with long narrow forewings capable of powerful flight and hovering over flowers to feed | Synonyms: hawk moth, hawkmoth, hummingbird moth, sphinx moth |
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| turgid | (adjective) ostentatiously lofty in style | Synonyms: bombastic, declamatory, large, orotund, tumid |
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| (adjective) abnormally distended especially by fluids or gas | Synonyms: bloated, distended, intumescent, puffy, swollen, tumescent, tumid |