Merriam-Webster's Collegiate® Dictionary, 11th Edition
LOAF
I. noun (plural loaves)
Etymology: Middle English lof, from Old English hlāf; akin to Old High German hleib loaf Date: before 12th century a shaped or molded mass of bread, a shaped or molded often symmetrical mass of food, head , mind ,
II. intransitive verb
Etymology: probably back-formation from loafer
Date: 1835
to spend time in idleness, see: idle