"article of food," early 14c., from Anglo-French viaunde, Old French viande "food (vegetable as well as animal), victuals, provisions" (11c.), a dissimilation of Vulgar Latin *vivanda, from Late Latin vivenda "things for living, things to be lived upon," in classical Latin, "be live," neuter plural gerundive of vivere "to live" (from PIE root *gwei- "to live"). The French word later was restricted to fresh meat.
"thin, slight, slender, eager," 1630s; any modern use traces to Milton ("Lycidas," 124), who may have invented it out of dialectal scranny, a variant of scrawny. Or it might have been an existing word from a Scandinavian source akin to Norwegian skran "rubbish." Also compare English dialectal and Scottish skran "scraps, broken victuals; refuse," in military slang "food," which is of obscure origin, hence out on the scran "begging."