大蛇

/woro₂ti/ → */worəti/ → /woroti/ → /orotɕi/

Possibly from 尾ろ (woro₂, “tail”) +‎ 霊 (chi, “spirit”). The kanji are jukujikun (熟字訓).

• (Tokyo) お​ろち [óꜜròchì] (Atamadaka – [1])[1][2][3]
• IPA^(key): [o̞ɾo̞t͡ɕi]

大蛇(おろち) • (orochi) ^{←をろち (woroti)?}

1. (literally) a large snake
   • 931–938, Minamoto no Shitagō, Wamyō Ruijushō (book 8, page 55)

     虵 [...] 一名久知奈波、日本紀私記云、虵、乎路知 [...] 毒虫也 [...]

(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)

• (Tokyo) だ​いじゃ [dáꜜìjà] (Atamadaka – [1])
• IPA^(key): [da̠iʑa̠]

大(だい)蛇(じゃ) • (daija) 

1. (literally) a large snake

• 八(ヤ)岐(マタノ)大(オ)蛇(ロチ) (Yamatanoorochi)
• 蟒(うわ)蛇(ばみ) (uwabami)
• 蛇(くちなわ) (kuchinawa), 蛇(へび) (hebi), 蛇(へみ) (hemi)

• Minamoto, Shitagō; Kyōto Daigaku Bungakubu Kokugogaku Kokubungaku Kenkyūshitu (931–938) Shohon Shūsei Wamyō Ruijushō: Honbunhen (in Japanese), Kyōto: Rinsen, published 1968, →ISBN.