The Collaborative International Dictionary of English v.0.48:

Heed \Heed\ (h[=e]d), v. t. [imp. & p. p. Heeded; p. pr. & vb.
   n. Heeding.] [OE. heden, AS. h[=e]dan; akin to OS.
   h[=o]dian, D. hoeden, Fries. hoda, OHG. huoten, G. h["u]ten,
   Dan. hytte. [root]13. Cf. Hood.]
   To mind; to regard with care; to take notice of; to attend
   to; to observe.
   [1913 Webster]

         With pleasure Argus the musician heeds.  --Dryden.

   Syn: To notice; regard; mind. See Attend, v. t.
        [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Heed \Heed\, n.
   1. Attention; notice; observation; regard; -- often with give
      or take.
      [1913 Webster]

            With wanton heed and giddy cunning.   --Milton.
      [1913 Webster]

            Amasa took no heed to the sword that was in Joab's
            hand.                                 --2 Sam. xx.
                                                  10.
      [1913 Webster]

            Birds give more heed and mark words more than
            beasts.                               --Bacon.
      [1913 Webster]

   2. Careful consideration; obedient regard.
      [1913 Webster]

            Therefore we ought to give the more earnest heed to
            the things which we have heard.       --Heb. ii. 1.
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   3. A look or expression of heading. [R.]
      [1913 Webster]

            He did it with a serious mind; a heed
            Was in his countenance.               --Shak.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Heed \Heed\, v. i.
   To mind; to consider.
   [1913 Webster]

WordNet (r) 3.0 (2006):

heed
    n 1: paying particular notice (as to children or helpless
         people); "his attentiveness to her wishes"; "he spends
         without heed to the consequences" [syn: attentiveness,
         heed, regard, paying attention] [ant: heedlessness,
         inattentiveness]
    v 1: pay close attention to; give heed to; "Heed the advice of
         the old men" [syn: heed, mind, listen]

Moby Thesaurus II by Grady Ward, 1.0:

167 Moby Thesaurus words for "heed":
   TLC, abide by, accept, accordance, acquittal, acquittance,
   act up to, adhere to, adherence, advertence, advertency, alertness,
   animadvert, anticipation, application, assiduity, assiduousness,
   attend, attend to, attend to orders, attention, attention span,
   attentiveness, audience, auscultate, awareness, be all ears,
   be concerned, be faithful to, bear in mind, bend an ear, bug,
   calculation, canniness, care, careful consideration, carefulness,
   carrying out, caution, cautiousness, circumspection,
   circumspectness, cock the ears, cognizance, compliance, comply,
   comply with, concentration, concern, conform, conform to,
   conformance, conformity, consciousness, consider, consideration,
   debate, defer to, deliberate stages, deliberateness, deliberation,
   diligence, discharge, discretion, do justice to, ear, earnestness,
   eavesdrop, examine by ear, execution, fill, follow,
   follow the book, forethought, fulfill, fulfillment, gingerliness,
   give attention, give audience to, give ear, give heed to,
   guardedness, hark, harken to, hear, hear out, hearing, hearken,
   hedge, hedging, heedfulness, heeding, hesitation, hold by,
   intentiveness, intentness, intercept, interest, judiciousness,
   keep, keep faith with, keeping, lend an ear, listen, listen at,
   listen in, listen to, live up to, look, loving care, make good,
   mark, meet, mind, mindfulness, note, notice, obey, obey the rules,
   observance, observation, observe, pawkiness, pay attention,
   pay attention to, performance, practice, preparedness,
   prior consultation, prudence, prudentialness, reck, regard,
   regardfulness, remark, respect, safeness, safety first,
   satisfaction, satisfy, see, sit in on, slowness to act, solicitude,
   stay in line, study, submit, take, take an interest, take note,
   take note of, take notice, take orders, tap, tend,
   tender loving care, tentativeness, think, thoroughness, thought,
   thoughtfulness, toe the line, uncommunicativeness,
   unprecipitateness, view, watch, wiretap