From The Collaborative International Dictionary of English v.0.48:
But \But\, v. i. [imp. & p. p. Butted; p. pr. & vb. n. Butting.] See Butt, v., and Abut, v. [1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Butt \Butt\, v. i. [imp. & p. p. Butted; p. pr. & vb. n. Butting.] [OE. butten, OF. boter to push, F. bouter. See Butt an end, and cf. Boutade.] 1. To join at the butt, end, or outward extremity; to terminate; to be bounded; to abut. [Written also but.] [1913 Webster]
And Barnsdale there doth butt on Don's well-watered ground. --Drayton. [1913 Webster]
2. To thrust the head forward; to strike by thrusting the head forward, as an ox or a ram. [See Butt, n.] [1913 Webster]
A snow-white steer before thine altar led, Butts with his threatening brows. --Dryden. [1913 Webster]
From The Collaborative International Dictionary of English v.0.48:
Butting \But"ting\, n. An abuttal; a boundary. [1913 Webster]
Without buttings or boundings on any side. --Bp. Beveridge. [1913 Webster]