tinder · noun, verb1
- Proto-Germanic · derived from*tundrą
- Old English · inherited fromtynder
- Middle English · inherited fromtinder
- English todaytinder
From Middle English tinder, tunder, tender, tonder, from Old English tynder, from Proto-Germanic *tundrą, *tundrǭ (“tinder”). Compare Saterland Frisian Tunder (“tinder”), Dutch tonder (“tinder”), German Zunder (“tinder”), Swedish tända (“to light, to set on fire”). More at tind.
Tinder · proper noun, verb2
The application's name is likely derived from the verb tinder (“to set fire to, to torch”), and a play on the various meanings of match (the prototype was called MatchBox).
Etymology from Wiktionary, CC BY-SA 4.0.