English

hebdometre

From hebdo- + metre.

Proto-Indo-European *septḿ̥ ‘seven’

Proto-Indo-European *septm̥mós ‘seventh’

Proto-Hellenic *hébdomos

Ancient Greek ἕβδομος ‘seventh’

Proto-Indo-European *meh₁- ‘to measure’

Ancient Greek μέτρον ‘measure, rule, length, size, poetic metre’

Latin metrum

French mètre ‘metre/meter’

English metre

The story

Proposed by Rudolf Clausius in the 1880s.

noun A unit of length equal to 10⁷ metres.

Language periods are conventional ranges, not dates for this word.

Etymograph / hebdometre