fouln.[See Fowl.] A bird.(Chaucer.)a.[OE. foul, ful, AS. fl; akin to D. vuil, G. faul rotten, OHG. fl, Icel. fl foul, fetid; Dan. fuul, Sw. ful foul, Goth. fls fetid, Lith. puti to be putrid, L. putere to stink, be putrid, pus pus, Gr. py`on pus, to cause to rot, Skr. py to stink. 82. Cf. Defile to foul, File to foul, Filth, Pus, Putrid.]1. Covered with, or containing, extraneous matter which is injurious, noxious, offensive, or obstructive; filthy; dirty; not clean; polluted; nasty; defiled; as, a foul cloth; foul hands; a foul chimney; foul air; a ship's bottom is foul when overgrown with barnacles; a gun becomes foul from repeated firing; a well is foul with polluted water.()My face is foul with weeping. (Job. xvi. 16.)2. Scurrilous; obscene or profane; abusive; as, foul words; foul language.()3. Hateful; detestable; shameful; odious; wretched.(Shak.)Who first seduced them to that foul revolt? (Milton.)4. Loathsome; disgusting; as, a foul disease.()5. Ugly; homely; poor.(Chaucer.)Let us, like merchants, show our foulest wares. (Shak.)6. Not favorable; unpropitious; not fair or advantageous; as, a foul wind; a foul road; cloudy or rainy; stormy; not fair; -- said of the weather, sky, etc.()So foul a sky clears not without a storm. (Shak.)7. Not conformed to the established rules and customs of a game, conflict, test, etc.; unfair; dishonest; dishonorable; cheating; as, foul play.()8. Having freedom of motion interfered with by collision or entanglement; entangled; -- opposed to clear; as, a rope or cable may get foul while paying it out.()()Foul anchor. (Naut.) See under Anchor. -- Foul ball (Baseball), a ball that first strikes the ground outside of the foul ball lines, or rolls outside of certain limits. -- Foul ball lines (Baseball), lines from the home base, through the first and third bases, to the boundary of the field. -- Foul berth (Naut.), a berth in which a ship is in danger of fouling another vesel. -- Foul bill, or Foul bill of health, a certificate, duly authenticated, that a ship has come from a place where a contagious disorder prevails, or that some of the crew are infected. -- Foul copy, a rough draught, with erasures and corrections; -- opposed to fair or clean copy. Some writers boast of negligence, and others would be ashamed to show their foul copies. Cowper. -- Foul proof, an uncorrected proof; a proof containing an excessive quantity of errors. -- Foul strike (Baseball), a strike by the batsman when any part of his person is outside of the lines of his position. -- To fall foul, to fall out; to quarrel. [Obs.] If they be any ways offended, they fall foul. Burton. -- To fall foul of or To run foul of. See under Fall. -- To make foul water, to sail in such shallow water that the ship's keel stirs the mud at the bottom.()v. t.1. To make filthy; to defile; to daub; to dirty; to soil; as, to foul the face or hands with mire.()2. (Mil.) To incrust (the bore of a gun) with burnt powder in the process of firing.()3. To cover (a ship's bottom) with anything that impered its sailing; as, a bottom fouled with barnacles.()4. To entangle, so as to impede motion; as, to foul a rope or cable in paying it out; to come into collision with; as, one boat fouled the other in a race.()v. i.1. To become clogged with burnt powder in the process of firing, as a gun.()2. To become entagled, as ropes; to come into collision with something; as, the two boats fouled.()n.1. An entanglement; a collision, as in a boat race.()2. (Baseball) See Foul ball, under Foul, a.()3. In various games or sports, an act done contrary to the rules; a foul stroke, hit, play, or the like.()