Webster's English Dictionary

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barnacle

bar.na.cle \'ba:r-ni-k*l\ \-k*ld\ n [ME barnakille, alter. of bernake, of 
   Celt origin; akin to Corn ]brennyk limpet 1: a European goose (Branta 
   leucopsis) that breeds in the artic and i s larger than the related brant - 
   called also barnacle goose 2: any of numerous marine crustaceans (order 
   Cirripedia) with feathery appe ndages for gathering food that are 
   free-swimming as larvae but fixed to rocks or floating logs as adults - 
   bar.na.cled aj