haversack definition by Webster's New World
Origin: French havresac ; from German habersack, literally , sack of oats ; from haber (now hafer ; from LowG), akin to eastern; English dialect, dialectal haver, oats (? origin, originally “goat food” ; from Indo-European base an unverified form kapro- from source Classical Latin caper, goat) plush German sack, sack
haversack definition by American Heritage Dictionary
Origin: French havresac, from obsolete German Habersack : German dialectal Haber, oats (from Middle High German habere, from Old High German habaro) + German Sack, bag (from Middle High German sac, from Old High German, from Latin saccus; see sack1).