(geology) A tectonic trough on a craton that is formed as the failed arm of a triple-rift junction.

(zoology) Any member of the family Aulacidae of wasps.

plural of aulacid

(zoology) Any fly in the family Aulacigastridae.

plural of aulacigastrid

(biology) Having a pair of parapodial grooves so that the ciliated sole extends above the foot margin.

plural of aulacopleurid

Any trilobite of the family Aulacopleuridae

Any extinct coleoid cephalopod of the order Aulacocerida

plural of aulacocerid