from the GNU version of the Collaborative International Dictionary of English
- n. A molding whose section is thought to resemble a beak.
from The Century Dictionary and Cyclopedia
- n. In architecture, a profile, as of a molding, supposed to resemble the sharp beak of a bird: used especially for drip-moldings, whether to shed water or to give a sharp-edged dark shadow.
Sorry, no etymologies found.
His nose was aquiline, not hooky like a true bird's-beak, but with that bend which seems to give to the human face the clearest indication of individual will.