ADJECTIVE (4)

1. having a heading or course in a certain direction;
- Example: "westward headed wagons"

2. having a heading or caption;
- Example: "a headed column"
- Example: "headed notepaper"

3. having a head of a specified kind or anything that serves as a head; often used in combination;
- Example: "headed bolts"
- Example: "three-headed Cerberus"
- Example: "a cool-headed fighter pilot"

4. of leafy vegetables; having formed into a head;
- Example: "headed cabbages"

The Collaborative International Dictionary of English v.0.48:

Head \Head\ (h[e^]d), v. t. [imp. & p. p. Headed; p. pr. & vb.
   n. Heading.]
   1. To be at the head of; to put one's self at the head of; to
      lead; to direct; to act as leader to; as, to head an army,
      an expedition, or a riot. --Dryden.
      [1913 Webster]

   2. To form a head to; to fit or furnish with a head; as, to
      head a nail. --Spenser.
      [1913 Webster]

   3. To behead; to decapitate. [Obs.] --Shak.
      [1913 Webster]

   4. To cut off the top of; to lop off; as, to head trees.
      [1913 Webster]

   5. To go in front of; to get in the front of, so as to hinder
      or stop; to oppose; hence, to check or restrain; as, to
      head a drove of cattle; to head a person; the wind heads a
      ship.
      [1913 Webster]

   6. To set on the head; as, to head a cask.
      [1913 Webster]

   To head off, to intercept; to get before; as, an officer
      heads off a thief who is escaping. "We'll head them off at
      the pass."

   To head up,
      (a) to close, as a cask or barrel, by fitting a head to.
      (b) To serve as the leader of; as, to head up a team of
          investigators.
          [1913 Webster +PJC]

The Collaborative International Dictionary of English v.0.48:

Headed \Head"ed\, a.
   1. Furnished with a head (commonly as denoting intellectual
      faculties); -- used in composition; as, clear-headed,
      long-headed, thick-headed; a many-headed monster.
      [1913 Webster]

   2. Formed into a head; as, a headed cabbage.
      [1913 Webster]

WordNet (r) 3.0 (2006):

headed
    adj 1: having a heading or course in a certain direction;
           "westward headed wagons"
    2: having a heading or caption; "a headed column"; "headed
       notepaper" [ant: unheaded]
    3: having a head of a specified kind or anything that serves as
       a head; often used in combination; "headed bolts"; "three-
       headed Cerberus"; "a cool-headed fighter pilot" [ant:
       headless]
    4: of leafy vegetables; having formed into a head; "headed
       cabbages"