Merriam-Webster's Collegiate® Dictionary, 11th Edition
GROAT
I. noun
Etymology: Middle English grotes, plural, from Old English grotan, plural of grot; akin to Old English grēot grit
Date: 12th century
hulled grain broken into fragments larger than grits, a grain (as of oats) exclusive of the hull,
II. noun
Etymology: Middle English groot, from Middle Dutch
Date: 14th century
an old British coin worth four pennies