牢 ろう Also written 籠, 篭 Meanings Noun prison; jail; gaol たる-adjective firm; solid; strong See also: 牢として (ろうとして). Kanji 牢 prison; jail; hardness. Read as ロウ. Words containing 牢 堅牢 (けんろう) solid 牢獄 (ろうごく) prison 牢屋 (ろうや) jail And 24 more. Jinuma: Japanese Dictionary · Word lists