n. (pl. -ies) 1 a horse of any small breed. 2 a small drinking-glass. 3 (in pl.) sl. racehorses. 4 Brit. sl. $25. pony-tail a person's hair drawn back, tied, and hanging down like a pony's tail. pony-trekker a person who travels across country on a pony for pleasure. pony-trekking this as a hobby or activity.
[ perh. f. poulney (unrecorded) f. F poulenet dimin. of poulain foal ]