卯榫 Traditional form: 卯榫 Pinyin (reading): mǎosǔn Definitions: mortise and tenon (slot and tab forming a carpenter's joint) Characters: 卯 - 4th terrestrial branch; period from 5-7 a.m. 榫 - mortise and tenon; to fit into Traditional characters: 卯 - 4th terrestrial branch; period from 5-7 a.m. 榫 - mortise and tenon; to fit into