n. In ornithology, same as martin, 1.n. Nautical, the name formerly given to a small line fastened to the leech of a sail to bring it close to the yard when the sail is furled. Also martnet.n. Some kind of water-mill. Cath. Anglicum, p. 229.—2. A military engine of the middle ages.n. A rigid disciplinarian, especially in the army or navy; a stickler for routine or regularity in small details.