Webster's English Dictionary

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amaryllis

am.a.ryl.lis \.am-*-'ril-*s\ n [NL, genus name, prob. fr. L, name of a 
   shepherdess in Virgil's Eclogues] : any of a genus (Amaryllis of the family 
   Amaryllidaceae, the amaryl lis family) of bulbous African herbs with showy 
   umbellate flowers; also : a plant of any of several genera (as Hippeastrum 
   or Sprebelia)