[ < French céphalomètre (P. Topinard 1876); compare -metercomb. form2] ‘an instrument formerly used for ascertaining the size of the fœtal head during parturition; also, an instrument used in the measurement of the different angles of the skull’ ( New Sydenham Soc. Lexicon).
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1878 R. T. H. Bartley tr. P. Topinard Anthropol.ii. iii. 296 A special cephalometer.