from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. around or encircling the mouth.
from The Century Dictionary and Cyclopedia
- Surrounding the mouth; situated about the mouth.
Sorry, no etymologies found.
He derived the central nervous system of the Chordata from the circumoral ring of the common ancestor by means of the hypothesis that both the pre-blastoporal and the post-blastoporal parts of it disappeared. [