Sprat \Sprat\ (spr[a^]t), n. [OE. sprot, sprotte, D. sprot; akin to G. sprotte.] (Zool.) (a) A small European herring ({Clupea sprattus}) closely allied to the common herring and the pilchard; -- called also {garvie}. The name is also applied to small herring of different kinds. (b) A California surf-fish ({Rhacochilus toxotes}); -- called also {alfione}, and {perch}. [1913 Webster] {Sprat borer} (Zool.), the red-throated diver; -- so called from its fondness for sprats. See {Diver}. {Sprat loon}. (Zool.) (a) The young of the great northern diver. [Prov. Eng.] (b) The red-throated diver. See {Diver}. {Sprat mew} (Zool.), the kittiwake gull. [1913 Webster]