大便|だいべんdaiben[3]nakadaka (mid-high)

1. nounfeces; faeces; excrement; stool

• SynonymくそCasualChild's word for poop; also means something dirty. 「大便」 is the neutral, formal term.
• SynonymうんこCasualColloquial word for poop; originally baby talk but now widely used in everyday speech. 「大便」 is more formal.
• SynonymウンチCasualKatakana spelling of 「うんち」; a mild, childlike way to say poop, softer than 「大便」.
• Synonym排泄物はいせつぶつNeutralRefers to bodily waste (「排泄物の処理」); mostly used in medical and nursing settings.
• Synonym糞便ふんべんNeutralMedical term for feces (「糞便検査」); used in clinical contexts.
• Related汚穢おわいWrittenWritten word for excrement and filth; old-fashioned and rarely used.
• Antonym小便しょうべんNeutralUrine or the act of urinating (「小便をする」); the counterpart to 「大便」.

Use 「大便」 as the neutral, formal word for feces (「大便をする」「大便検査」). In medical contexts say 「糞便」, in nursing 「排泄物」. With children or in casual talk use 「うんこ」 or 「ウンチ」; 「汚穢」 is old written language. The opposite is 「小便」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 消化しょうか器官きかんを有ゆうする動物どうぶつが、摂取せっしゅした食物しょくもつを消化しょうかした後あとに残のこった未み消化しょうかの残滓ざんしで、消化しょうか器官きかんから排出はいしゅつするもの。