morsel (n.)

late 13c., "a bite, mouthful; small piece of food, fragment," from Old French morsel (Modern French morceau) "small bite, portion, helping," diminutive of mors "a bite," from Latin morsum, neuter of morsus  "biting, a bite," past participle of mordēre "to bite," which is perhaps from an extended form of PIE root *mer- "to rub away, harm."