1. The ear, or its lobe.
2. That which projects like an ear, especially. That by which anything is supported, carried, or grasped, or to which a support is fastened; an ear; as, the lugs of a kettle; the lugs of a founders flask; the lug (handle) of a jug.
3. (Science: machinery) a projecting piece to which anything, as a rod, is attached, or against which anything, as a wedge or key, bears, or through which a bolt passes, etc.
4. The leather loop or ear by which a shaft is held up.
5. (Science: zoology) The lugworm.
(Science: machinery) lug bolt, a bolt terminating in a long, flat extension which takes the place of a head; a strap bolt.
Origin: Sw. Lugg the forelock.