n a browning of the skin resulting from exposure to the rays of the sun
n a light brown the color of topaz
n ratio of the opposite to the adjacent side of a right-angled triangle
v treat skins and hides with tannic acid so as to convert them into leather
v get a tan, from wind or sun
n. （日晒后皮肤的）黝黑色；（用于鞣革的）鞣料（tan的复数形式）