複数辞典一括検索+
《?a1200》 
(O)F cas ＜ L c
sum that which has happened (p.p.) ← cadere to fall, fall out ← IE 
kad-🔗⭐🔉
《?a1200》 (O)F cas ＜ L csum that which has happened (p.p.) ← cadere to fall, fall out ← IE kad- to fall: ⇒cadence
case２ /k
s/→
研究社新英和大辞典 ページ 177584 での【Op.p.】単語。
