mortise (slot cut into wood to receive a tenon); 4th earthly branch: 5-7 a.m., 2nd solar month (6th March-4th April), year of the Rabbit; ancient Chinese compass point: 90° (east); variant of 鉚|铆[mao3]; to exert one's strength; old variant of 卯[mao3]; variant of 卯[mao3]