An ancient medical instrument or device used for head measurements or medical procedures on the head.
From Greek 'kephalē' (head) + '-tron' (suffix meaning 'instrument'). This combines the head root with the Greek suffix that denotes tools or mechanical devices.
Ancient physicians designed special instruments just for the head, and the suffix '-tron' tells us it was a tool—though we don't use cephaletrons today, the naming convention lives on in modern medical devices like 'cyclotron' and 'spectrophotometer'!
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