conch

n (a) shellfish with a large spiral shell 海螺（有大螺旋贝壳的贝类）. (b) shell of this creature 海螺壳.

concept, conception, conceptive, conceptual, concern, concerned, concernedly, concerning, concert, concert grand, concert-goer, concert-master, concerted, concertina, concerto, concess, concession, concessionaire, concessionary, concessive, conchology, conciliate, conciliation, conciliatory, concise, concisely, conciseness, conciseness, concision, concision, conclave, conclude, conclusion, conclusive, conclusively, concoct, concoction, concomitant, concord, concordance, concordant,