terebrantia

from The Century Dictionary.

• In Latreille's system, one of the two prime divisions of the order Hymenoptera, comprising those forms which have the abdomen of the females furnished with an instrument employed as a saw or a borer for depositing their eggs: opposed to Aculeata, in which the abdomen is armed with a sting, and divided into Securifera and Pupivora.
• In Crustacea, the boring or burrowing cirripeds; the Alcippidæ.

from the GNU version of the Collaborative International Dictionary of English.

• noun plural (Zoöl.) A division of Hymenoptera including those which have an ovipositor adapted for perforating plants. It includes the sawflies.