The Collaborative International Dictionary of English v.0.48:

Alstroemeriaceae \Alstroemeriaceae\ n.
   1. 1 one of many families or subfamilies into which some
      classification systems subdivide the Liliaceae but not
      widely accepted; sometimes included in subfamily
      Amaryllidaceae.

   Syn: family Alstroemeriaceae.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Alstroemeriaceae
    n 1: one of many families or subfamilies into which some
         classification systems subdivide the Liliaceae but not
         widely accepted; sometimes included in subfamily
         Amaryllidaceae [syn: Alstroemeriaceae, family
         Alstroemeriaceae]