Plural of drawtube; multiple sliding tubes used in optical instruments or mechanical devices for adjustment and focus.
Plural form of drawtube. The form became common in scientific literature describing instrument components.
Drawtubes plural shows up in antique microscope catalogs—Victorian scientists would brag about their microscope's quality based partly on how smoothly its drawtubes slid, a tactile measure of precision.
Complete word intelligence in one call. Free tier — 50 lookups/day.