late 15c., "a kind of thin, worsted wool yarn used in embroidery and fancy work," of unknown origin. Hence crewel-work, kind of embroidery done by crewel, usually upon linen (1849).
"sweeten, spice, and heat (a drink)," c. 1600, of unknown origin. Perhaps from Dutch mol, a kind of white, sweet beer, or from Flemish molle a kind of beer, and related to words for "to soften." Related: Mulled; mulling.
1846 as a kind of sauce served with meat; 1975 as a kind of dance music; separate borrowings from Spanish, literally "sauce," from Vulgar Latin *salsa "condiment" (see sauce (n.)). In American Spanish it is especially used of a kind of relish with chopped-up ingredients; the music is a "blend" of Latin jazz and rock styles.
"a thing of the same kind as, or nearly allied to, another," 1730s, from French congénère (16c.), from Latin congener "of the same race or kind," from assimilated form of com "with, together" (see con-) + gener-, stem of genus "race, kind" (from PIE root *gene- "give birth, beget," with derivatives referring to procreation and familial and tribal groups). Related: Congenerous (1640s); congeneracy.