The Collaborative International Dictionary of English v.0.48:

Cyclades \Cyclades\ n.
   1. the pre-Mycenaean civilization on the Cyclades islands in
      the S Aegean sea.

   Syn: Cycladic civilization, Cycladic culture.
        [WordNet 1.5]

   2. an archipelago consisting of over 200 islands in the
      southern Aegean sea.
      [WordNet 1.5]

WordNet (r) 3.0 (2006):

Cyclades
    n 1: the Bronze Age civilization on the Cyclades islands in the
         southern Aegean Sea that flourished 3000-1100 BC [syn:
         Cycladic civilization, Cycladic civilisation, Cycladic
         culture, Cyclades]
    2: a group of over 200 islands in the southern Aegean [syn:
       Cyclades, Kikladhes]