[a. mod.L. corrūgātor, agent-n. f. corrūgāre to CORRUGATE.]

1

  1.  Anything that corrugates or causes corrugation. rare.

2

1782.  A. Monro, Anat., 215. Styptics, and other like corrugators, are vainly applied.

3

  2.  Anat. Each of the two small muscles that contract the brows in the action of frowning.

4

[1706.  Phillips, Corrugator Supercilii.]

5

1839.  Todd, Cycl. Anat., II. 280/2. The corrugator and frontalis muscles.

6

1872.  Darwin, Emotions, ix. 222. The corrugators, by their contraction, lower the eyebrows and bring them together, producing vertical furrows on the forehead, that is, a frown.

7