A black and white auk, Alca torda, which has a deep, narrow, almost rectangular bill and nests on coastal cliffs around the North Atlantic and the…

Of a bird: having a deep, narrow bill likened to a cut-throat razor in shape.

having a serrated bill.

toothed-billed (= tooth-billed, adj.); also frequently as the second element in parasynthetic combinations, as buck-toothed, sweet-toothed.

Having one or more tooth-like projections on the edge of the bill; dentirostral or serratirostral.

= saw-billed adj.