• (n.) An instrument measuring the dimensions of the head of a fetus during delivery.
An instrument used to position the head to produce oriented, reproducible lateral and posterior-anterior headfilms. ... Synonym: cephalostat. ... Origin: cephalo-+ G. Metron, measure ... (05 Mar 2000) ... 
(sef″ә-lom´ә-tәr) an instrument for measuring the head; an orienting device for positioning the head for radiographic examination and measurement.
Ceph`a·lom'e·ter noun [ Cephalo- + -meter .] (Medicine) An instrument measuring the dimensions of the head of a fetus during delivery. 
Type: Term Pronunciation: sef′ă-lom′ĕ-ter Definitions: 1. An instrument used to position the head to produce oriented, reproducible lateral and posteroanterior head films. Synonyms: cephalostat
an instrument for measuring the human head. Cf. craniometer.