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From The Collaborative International Dictionary of English v.0.48:
Grogginess \Grog"gi*ness\ (gr[o^]g"g[i^]*n[e^]s), n. 1. State of being groggy. [1913 Webster] 2. (Man.) Tenderness or stiffness in the foot of a horse, which causes him to move in a hobbling manner. [1913 Webster]