2. Adjective. 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. ¹
3. Noun. A wasp in the ''Sphecidae'' family. ¹
¹ Source: wiktionary.com