What does microcephalous mean?
Microcephalous is a technical adjective describing an abnormally small head or cranium. It is especially used in medicine, anatomy, and physical anthropology to characterize a skull or a person whose head is unusually small relative to the body. In clinical contexts, the condition is usually called microcephaly. The word describes a physical measurement, not intelligence, personality, or ability, and its specialized register means it is rarely appropriate in ordinary conversation. Microcephalous appears most often in historical or comparative descriptions of crania and in technical discussions of developmental anatomy. Although uncommon, it is useful because it names the morphology directly: the Greek-derived micro- means “small,” while -cephalous relates to the head. Recognising the term also helps distinguish abnormally small cranial proportions from other skull shapes, including the separate condition called brachycephaly, in which the skull is short and broad.
adjectiveHaving an abnormally small head or cranium, especially relative to the body. The term is used principally in medicine, anatomy, and physical anthropology.
- Having an abnormally small head or cranium, especially relative to the body.
"The anthropologist noted that the specimen had a markedly microcephalous cranium."
"The anthropological report described the skull as microcephalous, with an unusually small cranial capacity."
"Radiological findings showed that the child was microcephalous."
The word practically announces its meaning: Greek micro- means “small,” and -cephalous means “headed.”
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does microcephalous come from?
Microcephalous was formed in scientific usage from Greek combining forms. Its first element, micro-, comes from Greek mikros, meaning “small,” while -cephalous derives from Greek kephalē, meaning “head,” with the English adjective suffix -ous. The same Greek head-root produced related terms such as cephalic, encephalic, macrocephaly, and brachycephaly.
Related word forms
How microcephalous is actually used
A formal, specialized term used in medical, anatomical, and anthropological writing. In modern clinical contexts, the condition is more commonly named microcephaly; the adjective describes the physical morphology and does not itself imply anything about intelligence or personality.
Easily confused with microcephalous
Microcephalous means having an abnormally small head or cranium, whereas brachycephalic describes a disproportionately short and broad skull.