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Douglas Harper's Etymology Dictionary
moon-calf

also mooncalf, "abortive, shapeless, fleshy mass," 1560s, attributed to the influence of the moon; from moon (n.) + calf (n.). In later 16c., "deformed creature, monster."

Wiktionary
moon-calf

n. (alternative form of mooncalf English)

Usage examples of "moon-calf".

Incubi and succubae howled praise to Hecate, and headless moon-calves bleated to the Magna Mater.