The Collaborative International Dictionary of English v.0.48:

Brassicaceae \Brassicaceae\ n.
   a natural family of plants with four-petaled flowers.

   Syn: Cruciferae, family Cruciferae, family Brassicaceae,
        mustard family.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Brassicaceae
    n 1: a large family of plants with four-petaled flowers;
         includes mustards, cabbages, broccoli, turnips, cresses,
         and their many relatives [syn: Cruciferae, family
         Cruciferae, Brassicaceae, family Brassicaceae,
         mustard family]