razor shell
noun
1- a burrowing bivalve mollusc with a long slender shell which resembles the handle of a cut-throat razor. Also called JACKKNIFE or RAZOR CLAM. in North America.竹蛏（壳）（北美亦称JACKKNIFE CLAM或RAZOR CLAM）。
1.1
- Family Solenidae: Ensis and other genera.竹蛏科：剑蛏属及其他属。