Word Origin & History
c.1327, from O.Fr. losenge "windowpane, small square cake," etc., used for many flat quadrilateral things. Cognates in Sp. losanje, Catalan llosange, It. lozanga. Probably from a pre-Roman Celtic language, perhaps Iberian *lausa or Gaul. *lausa "flat stone" (cf. Prov. lausa, Sp. losa, Catalan llosa,
Port. lousa "slab, tombstone"), from a pre-Celtic language. Originally in Eng. a term in heraldry; meaning "small cake or tablet (originally diamond-shaped) of medicine and sugar, etc., meant to be held in the mouth and dissolved" is from 1530.