Morsel

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Middle English: from Old French, diminutive of mors ‘a bite’, from Latin mors- ‘bitten’, from the verb mordere .

wiktionary

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From Middle English morsel, from Old French morsel, from Medieval Latin morsellum(“a bit, a little piece”), diminutive of Latin morsum(“a bit”), neuter of morsus, perfect passive participle of mordeo(“I bite”). Compare French morceau.

etymonline

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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."