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From The Collaborative International Dictionary of English v.0.48:
Under \Un"der\, a. Lower in position, intensity, rank, or degree; subject; subordinate; -- generally in composition with a noun, and written with or without the hyphen; as, an undercurrent; undertone; underdose; under-garment; underofficer; undersheriff. [1913 Webster] Under covert (Zool.), one of the feathers situated beneath the bases of the quills in the wings and tail of a bird. See Illust. under Bird. [1913 Webster]