ra·zor·bill /-ˌbɪl/
  海雀類,一種尖嘴鳥
  Ra·zor·bill n. Zool. (a) A species of auk (Alca torda) common in the Arctic seas. See Auk, and Illust. in Appendix. (b) See Cutwater, 3.
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  razorbill
       n : black-and-white northern Atlantic auk having a compressed
           sharp-edged bill [syn: razor-billed auk, Alca torda]