English

flat-backed millipede

From flat + backed + millipede.

Proto-Germanic *flataz ‘flat’

Old Norse flatr ‘flat, level’

Middle English flat ‘level’

English flat

Latin mīllipeda ‘wood louse’

Today it means

noun Any large millipede of the order Polydesmida.

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

Etymograph / flat-backed millipede