English

roofbolt

From roof + bolt.

A compound of roof + bolt

Proto-Indo-European *ḱrapo-

Proto-Germanic *hrōfą

Proto-West Germanic *hrōf

Old English hrōf ‘roof’

Middle English rhof

English roof

Proto-Germanic *bultaz

Proto-West Germanic *bolt ‘bolt arrow’

Old English bolt

Middle English bolt

English bolt

Today it means

noun A safety bolt installed in the roof of an underground mine.

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

Etymograph / roofbolt