BILLOW

billow. Billow, v.i. to swell or roll like waves, to swell

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Bil″low (�), n. [[Cf. Icel. bylgja billow, Dan. bölge, Sw. bölja; akin to MHG. bulge billow, bag, and to E. bulge. See Bulge.]] 1. 1. A great wave or surge of the sea or other water, caused usually by violent wind.
Whom the winds waft where'er the billows roll. Cowper. 2. 2. A great wave or flood of anything. Milton.