慈姑 Traditional form: 慈姑 Pinyin (reading): cígu Definitions: arrowhead (Sagittaria subulata, a water plant) Characters: 慈 - gentle, humane, kind, merciful 姑 - father's sister; husband's mother Traditional characters: 慈 - gentle, humane, kind, merciful 姑 - father's sister; husband's mother