| acephaly | (noun) absence of the head (as in the development of some monsters) | Synonyms: acephalia, acephalism |
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| acrocephaly | (noun) a congenital abnormality of the skull; the top of the skull assumes a cone shape | Synonyms: oxycephaly |
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| anencephaly | (noun) a defect in brain development resulting in small or missing brain hemispheres | Synonyms: anencephalia |
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| brachycephaly | (noun) the quality of being brachycephalic | Synonyms: brachycephalism |
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| clinocephaly | (noun) a congenital defect in which the top of the head is depressed (concave instead of convex) | Synonyms: clinocephalism |
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| dolichocephaly | (noun) the quality of being dolichocephalic | Synonyms: dolichocephalism |
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| hydrocephaly | (noun) an abnormal condition in which cerebrospinal fluid collects in the ventricles of the brain; in infants it can cause abnormally rapid growth of the head and bulging fontanelles and a small face; in adults the symptoms are primarily neurological | Synonyms: hydrocephalus |
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| macrencephaly | (noun) an abnormally large braincase | - |
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| macrocephaly | (noun) an abnormally large head; differs from hydrocephalus because there is no increased intracranial pressure and the overgrowth is symmetrical | Synonyms: megacephaly, megalocephaly |
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| megacephaly | (noun) an abnormally large head; differs from hydrocephalus because there is no increased intracranial pressure and the overgrowth is symmetrical | Synonyms: macrocephaly, megalocephaly |
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| megalocephaly | (noun) an abnormally large head; differs from hydrocephalus because there is no increased intracranial pressure and the overgrowth is symmetrical | Synonyms: macrocephaly, megacephaly |
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| microcephaly | (noun) an abnormally small head and underdeveloped brain | Synonyms: microcephalus, nanocephaly |
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| nanocephaly | (noun) an abnormally small head and underdeveloped brain | Synonyms: microcephalus, microcephaly |
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| oxycephaly | (noun) a congenital abnormality of the skull; the top of the skull assumes a cone shape | Synonyms: acrocephaly |
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| plagiocephaly | (noun) congenital malformation of the skull in which the main axis of the skull is oblique | - |
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| scaphocephaly | (noun) congenital malformation of the skull which is long and narrow; frequently accompanied by mental retardation | - |
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