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A trifoliate plant used as a national emblem by the Irish. The legend is that St. Patrick once plucked a leaf of it for use in illustrating the doctrine of the trinity.

Having three leaves or leaflets, as clover. See Illust. of Shamrock.

a plant of the genus Oxalis (Oxalis Acetosella), having an acid taste. See Illust. (a) of Shamrock. -- Wood spirit. (Chem.) See Methyl alcohol, under Methyl. -- Wood stamp, a carved or engraved block or stamp of wood, for impressing figures or colors on fabrics. -- Wood star (Zoöl.), any one of several species of sm…