simnel n.

kind of sweet cake or bun made of fine flour, c. 1200, from Old French simenel "fine wheat flour; flat bread cake, Lenten cake," probably by dissimilation from Vulgar Latin *siminellus (also source of Old High German semala "the finest wheat flour," German Semmel "a roll"), a diminutive of Latin simila "fine flour" (see semolina). In England especially as a gift offered on certain holidays, but in America a type of squash.