| acephalous | (adjective) lacking a head or a clearly defined head | - |
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| anencephalic | (adjective) characterized by partial or total absence of a brain | Synonyms: anencephalous |
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| anencephalous | (adjective) characterized by partial or total absence of a brain | Synonyms: anencephalic |
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| bicephalous | (adjective) having two heads | - |
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| brachycephalic | (adjective) having a short broad head with a cephalic index of over 80 | Synonyms: brachycranial, brachycranic |
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| cephalic | (adjective) of or relating to the head | - |
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| cephalopod | (adjective) relating or belonging to the class Cephalopoda | Synonyms: cephalopodan |
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| cephalopodan | (adjective) relating or belonging to the class Cephalopoda | Synonyms: cephalopod |
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| dolichocephalic | (adjective) having a relatively long head with a cephalic index of under 75 | Synonyms: dolichocranial, dolichocranic |
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| electroencephalographic | (adjective) of or relating to an electroencephalograph | - |
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| hydrocephalic | (adjective) relating to or characterized by or evidencing hydrocephalus | - |
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| macrencephalic | (adjective) having a large brain case | Synonyms: macrencephalous |
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| macrencephalous | (adjective) having a large brain case | Synonyms: macrencephalic |
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| macrocephalic | (adjective) having an exceptionally large head and brain | Synonyms: macrocephalous |
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| macrocephalous | (adjective) having an exceptionally large head and brain | Synonyms: macrocephalic |
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| microcephalic | (adjective) having an abnormally small head and underdeveloped brain | Synonyms: microcephalous, nanocephalic |
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| microcephalous | (adjective) having an abnormally small head and underdeveloped brain | Synonyms: microcephalic, nanocephalic |
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| nanocephalic | (adjective) having an abnormally small head and underdeveloped brain | Synonyms: microcephalic, microcephalous |
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