racehorse

plural racehorses

1. A horse that competes in races.

   They were bosker horses. Until I went to work for Bill I didn't know how good racehorses are.

   1946, Frank Sargeson, That Summer, and Other Stories, page 31

   3 more examples

   Long before you see the lean, handsome heads peering mildly over the half-doors of the loose boxes, you know that East Ilsley's business is training racehorses.

   1980, AA Book of British Villages, Drive Publications Ltd, page 164

   Picture yourself betting on a racehorse, seeing the animal take the lead, and then watching the horse suddenly stop because it pulled a muscle not properly warmed up by its trainers. You’d get pretty heated under the collar, and that’s not the kind of warm-up that’s very beneficial. Horseflesh and humanflesh alike need to be warmed up before strenuous activity.

   1984, Steven Adcock, “[Breathing and Form, Warm-up, and Freebody Exercises] Warm-up”, in Steve Adcock’s Partner Workout: A Two-Person Exercise System that Provides Aerobic Benefits, Strength Building, and Flexibility Techniques Without the Need for a Gym or a Single Piece of Equipment, New York, N.Y.: M. Evans and Company, Inc., →ISBN, page 27

   Clearly, it’s that Secretariat is overrated. OK, exhale. I’m not trolling you. I’m just being extremely nitty about the marginal shades of “really, really great.” By “overrated,” I certainly don’t mean to imply that Secretariat isn’t the best 3-year-old American racehorse in history – he is.

   2015 June 12, Benjamin Morris, “Where Have You Gone, Secretariat?”, in FiveThirtyEight, archived from the original on 20 Dec 2016

2. Any member of certain species of genus Congiopodus.

   Synonyms: horsefish, pigfish