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From The Collaborative International Dictionary of English v.0.48:
Winterkill \Win"ter*kill`\, v. t. [imp. & p. p. Winterkilled; p. pr. & vb. n. Winterkilling.] To kill by the cold, or exposure to the inclemency of winter; as, the wheat was winterkilled. [U. S.] [1913 Webster]