| 古細菌 | [こさいきん, kosaikin] (n) archaea; archaebacteria [Add to Longdo] |
| 古参 | [こさん, kosan] (n, adj-no) seniority; long service; (P) [Add to Longdo] |
| 古参者 | [こさんしゃ, kosansha] (n) senior; old timer [Add to Longdo] |
| 古刹 | [こさつ, kosatsu] (n) ancient temple [Add to Longdo] |
| 故殺 | [こさつ, kosatsu] (n, vs) manslaughter [Add to Longdo] |
| 鼓索 | [こさく, kosaku] (n) chorda tympani [Add to Longdo] |
| 小さじ(P);小匙 | [こさじ, kosaji] (n) teaspoon; (P) [Add to Longdo] |
| 小さっぱりした | [こさっぱりした, kosapparishita] (adj-f) neat; tidy; trim [Add to Longdo] |
| 小雨 | [こさめ(P);しょうう;こあめ, kosame (P); shouu ; koame] (n) (See 少雨) light rain; drizzle; (P) [Add to Longdo] |
| 小鷺 | [こさぎ, kosagi] (n) (uk) little egret (Egretta garzetta) [Add to Longdo] |