n.1 a small peg or plug, esp. for insertion into the vent-hole of a cask.
2 a US a tap. b a device for controlling the flow of liquid in a tap.
3 the plain end of a pipe-section fitting into the socket of the next one.
Etymology: ME, perh. f. Prov. espigou(n) f. L spiculum dimin. of spicum SPICA