Definition of "chisel-shaped" []

• Shaped like a chisel: in entomology, specifically applied to the mandibles when they are curved at the tip and truncate, with a cutting edge turned inward. Also called scalpriform.

The Century Dictionary (Public Domain)

• "This rapid growth means that the bill can change shape very rapidly if the feeding style is changed, and captive individuals that were forced to switch from bivalve-feeding to a diet of lugworms changed from having chisel-shaped bills to tweezer-like bills within 10 days."
• "He lowered the branch to display two pile arrows, their chisel-shaped heads driven clear of the tough wood on either side."
• "The elder, Argurios, had a chisel-shaped black chin beard and bleak emotionless eyes."