Webster's English Dictionary

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gastropod

gas.tro.pod also gas.trop.o.dan also gas.trop.o.dous \'gas-tr*-.pa:d\ 
   \ga-'stra:p-*d-*n\ \-*d-*s\ n [NL Gastropoda, class name] : any of a large 
   class (Gastropoda) of mollusks (as snails) often with a u nivalve shell and 
   usu. a distinct head bearing sensory organs adj  - gastropod aj