The Collaborative International Dictionary of English v.0.48:

Caddy \Cad"dy\, n.; pl. Caddies. [Earlier spelt catty, fr.
   Malay kat[imac] a weight of 11/3 pounds. Cf. Catty.]
   1. A small box, can, or chest to keep tea in, also called
      tea caddy.
      [1913 Webster]

   2. a container to hold objects when not in use.
      [PJC]

   3. (Computers) a container to hold a compact disk, used in
      some types of compact disk devices, which is inserted into
      the CD player during playing, or in the case of recordable
      CD-ROMS, during recording. It is approximately square and
      thin, slightly larger than the compact disk. However, many
      CD players have a drawer for the compact disk, requiring
      no caddy.
      [PJC]

The Collaborative International Dictionary of English v.0.48:

Caddie \Cad"die\, n. [Written also caddy, cadie, cady, and
   cawdy.] [See Cadet.]
   1. A cadet. [Obs. Scot.]
      [Webster 1913 Suppl.]

   2. A lad; young fellow. [Scot.] --Burns.
      [Webster 1913 Suppl.]

   3. One who does errands or other odd jobs. [Scot.]
      [Webster 1913 Suppl.]

   4. An attendant who carries a golf player's clubs, tees his
      ball, etc.
      [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

caddy
    n 1: a can for storing tea [syn: caddy, tea caddy]
    v 1: act as a caddie and carry clubs for a player [syn:
         caddie, caddy]