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From The Collaborative International Dictionary of English v.0.48:
June \June\, n. [L. Junius: cf. F. Juin. So called either from Junius, the name of a Roman gens, or from Juno, the goddess.] The sixth month of the year, containing thirty days. [1913 Webster] And what is so rare as a day in June? Then, if ever, come perfect days. --Lowell. [1913 Webster] June beetle, June bug (Zool.), any one of several species of large brown beetles of the genus Lachnosterna and related genera; -- so called because they begin to fly, in the northern United States, about the first of June. The larv[ae] of the June beetles live under ground, and feed upon the roots of grasses and other plants. Called also May bug or May beetle. June grass (Bot.), a New England name for Kentucky blue grass. See Blue glass, and Illustration in Appendix. [1913 Webster]