| arachnidian | (adjective) relating to or resembling a member of the class Arachnida | Synonyms: arachnoid, spiderlike, spiderly, spidery |
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| cyprinid | (adjective) of or relating to members of fish family Cyprinidae | Synonyms: cyprinoid |
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| hominid | (adjective) characterizing the family Hominidae, which includes Homo sapiens as well as extinct species of manlike creatures | Synonyms: hominian |
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| nidicolous | (adjective) (of birds) remaining in the nest for a time after hatching | - |
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| nidifugous | (adjective) (of birds) leaving the nest shortly after hatching | - |
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| omnidirectional | (adjective) not directional | - |
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| snide | (adjective) expressive of contempt | Synonyms: sneering, supercilious |
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| transactinide | (adjective) of or belonging to the elements with atomic numbers greater than 103 | - |
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| unidentifiable | (adjective) impossible to identify | - |
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| unidentified | (adjective) being or having an unknown or unnamed source | Synonyms: nameless, unknown, unnamed |
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| (adjective) not yet identified | - |
| unidimensional | (adjective) relating to a single dimension or aspect; having no depth or scope | Synonyms: one-dimensional |
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| unidirectional | (adjective) operating or moving or allowing movement in one direction only | - |
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