English

rapheless

From raphe + -less.

Formed from raphe + -less

Ancient Greek ῥᾰ́πτω ‘to sew together, stitch’

Ancient Greek ῥᾰφή ‘seam’

New Latin raphē

English raphe

Today it means

adj Describing the valve of a monoraphid diatom that does not have a raphe

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

Etymograph / rapheless