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a. 1 of or pertaining to the Sphecidae family of wasps 2 of or pertaining to those wasps formerly classified in the Sphecidae before the discovery that bees belong to that group (now known as the order Apoidea); the members of the current Apoidea that aren't bees, including other families such as the Crabronidae. n. A wasp in the Sphecidae family.