potter wasp

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various solitary vespid wasps of the subfamily Eumeninae, especially those in the genus Eumenes, that characteristically build pot-shaped nests of clay.

from The Century Dictionary.

• noun A wasp of one of the genera Odynerus, Eumenes, etc., which builds mud cells in any convenient cylindrical cavity, such as a hollow reed, an accidentally folded paper, or the hole in a spool. O. flavipes and E. fraterna are good examples.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A group of wasps in the subfamily Eumeninae.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun any of various solitary wasps that construct vase-shaped cells of mud for their eggs