olemus
(3a) peenike korrutatud mittevillane lõng
(3b) analoogiline muu füüsiline struktuur

Wiktionary:
1. a long, thin and flexible form of material, generally with a round cross-section, used in sewing, weaving or in the construction of string
8. a filament, as of a flower, or of any fibrous substance, as of bark

https://en.wikipedia.org/wiki/Thread_(yarn)