Etymology 1
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From Old Japanese, from Proto-Japonic *mukantai, of unknown derivation; some theories include:
- a compound of 向かい (mukai, “facing”, the 連用形 (ren'yōkei, “continuative or stem form”) of verb 向かう (mukau, “to face”)) + 手 (te, “hand”), as the centipede's feet come in facing pairs
- a compound of 六 (mu, “six”) + 十 (ka, “ten”, unusual reading; compare the ga in 五十嵐 (igarashi)) + 手 (te, “hand”), literally "sixty hands"; centipedes have more or less than one hundred legs
- starting as a compound of 百 (momo, “hundred”) + が (ga, ancient possessive particle) + 手 (te, “hand”), shifting phonetically: /momo ɡa te/ → /mukade/
While the latter two theories seem plausible semantically, the devoicing of ga to ka is quite unusual.
The kanji are jukujikun (熟字訓), from Chinese 百足 (bǎizú).
Etymology 2
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From Middle Chinese 百足 (MC paek tsjowk).
Noun
百足 • (hyakusoku)
- (rare) a centipede
Usage notes
The mukade reading is much more common.