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From The Collaborative International Dictionary of English v.0.48:
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]