Limb, n. [L. limbus border. Cf. Limbo, Limbus.] A border or edge, in certain special uses. (a) (Bot.) The border or upper spreading part of a monopetalous corolla, or of a petal, or sepal; blade. (b) (Astron.) The border or edge of the disk of a heavenly body, especially of the sun and moon. (c) The graduated margin of an arc or circle, in an instrument for measuring angles.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.