from Wiktionary, Creative Commons Attribution/Share-Alike License
- adv. In a labial manner; by means of the lips.
from the GNU version of the Collaborative International Dictionary of English
- adv. In a labial manner; with, or by means of, the lips.
from The Century Dictionary and Cyclopedia
- In a labial manner; by means of the lips.
labial + -ly (Wiktionary)
Or, more accurately, labially and clitorally true in crotchal truing parlance.