English
protothread
From proto- + thread.
Proto-Indo-European *pér ‘through’
Proto-Indo-European *pró ‘forwards, before’
Proto-Hellenic *pró
Ancient Greek πρό ‘before’
Ancient Greek πρῶτος ‘first’
English proto-
Proto-Indo-European *terh₁- ‘rub’
Proto-Indo-European *treh₁-tu-s
Proto-Germanic *þrēduz ‘thread’
Old English þrǣd
Middle English thred
English thread
Today it means
noun A lightweight stackless thread used in concurrent programming.
Sources
Sources: Wiktionary, “protothread”. By Wiktionary contributors, CC BY-SA 4.0, via kaikki.org (dump of Oct 3 2026); text adapted and restructured. Language periods are conventional ranges, not dates for this word. License.
Etymograph / protothread