tenuirostral

from The Century Dictionary.

• Slender-billed, as a bird: formerly specifying the Tenuirostres, now simply descriptive. See cuts under bill and Promerops.

from the GNU version of the Collaborative International Dictionary of English.

• adjective (Zoöl.) Thin-billed; -- applied to birds with a slender bill, as the humming birds.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adjective zoology Having a thin bill.