Source : Webster's Revised Unabridged Dictionary (1913)

Siphonarid \Si`pho*na"rid\, n. (Zo["o]l.)
   Any one of numerous species of limpet-shaped pulmonate
   gastropods of the genus {Siphonaria}. They cling to rocks
   between high and low water marks and have both lunglike
   organs and gills. -- {Si`pho*na"rid}, a.

Siphonarid \Si`pho*na"rid\, n. (Zo["o]l.)
   Any one of numerous species of limpet-shaped pulmonate
   gastropods of the genus {Siphonaria}. They cling to rocks
   between high and low water marks and have both lunglike
   organs and gills. -- {Si`pho*na"rid}, a.