丸太

a log: unsawn lumber (UK) or timber (US), a section of a tree cut to a length and with the bark removed, but otherwise round and unfinished

alternate name for the 似鯉(にごい) (nigoi) fish (Hemibarbus barbus); more commonly known as ニゴイ (nigoi)

the Pacific redfin (Tribolodon brandtii); more commonly known as マルタウグイ (maruta ugui)

(historical, slang) during the Edo period, derogatory term for an unlicensed prostitute dressed as a Buddhist nun as a form of disguise from the authorities (from the way the shaven head looks a bit like a debarked log, and from the way that they both roll around)

(historical) human test subjects of Unit 731