Where does “レーダー” come from?

レーダー (Japanese) comes from English RADAR, from English ranging, from English range, from Middle English rengen, from Old French rengier, from Old French reng, from Latin rencus, from Gaulish rekos — to set in order.

レーダー (Japanese): radar

Definitions

  1. radar

Ancestry of “レーダー”, step by step

レーダー traces back through two separate lines of ancestry.

via English RADAR

StepLanguageWordMeaning
1EnglishRADARAcronym of radio detection and ranging
2Englishrangingpresent participle of range; Act of one who...
3EnglishrangeA line or series of mountains, buildings, etc; A...
4Middle Englishrengen
5Old Frenchrengierto line up; to form ranks
6Old Frenchrengplace; position
7Latinrencusrow; order, rank
8Gaulishrekos
9Proto-Celticreketito arrange
10Proto-Indo-European(H)rek-to set in order

via Ancient Greek Λήδᾱ

StepLanguageWordMeaning
1Ancient GreekΛήδᾱLeda
Every word from Proto-Indo-European (H)rek-
レーダー — Etymology, Origin & Word History | Etymology Explorer