English

subline

From sub- + line.

Formed from sub- + line

Proto-Indo-European *upó ‘up; from below’

Proto-Italic *supo ‘under’

Latin sub ‘under, beneath, below’

English sub-

Proto-Germanic *līną ‘flax’

Proto-Germanic *līnǭ ‘line’

Proto-West Germanic *līnā ‘line’

Old English līne ‘line’

Middle English line ‘rope’

English line

Today it means

noun A subset of a line (of cells in a strain)

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