The Collaborative International Dictionary of English v.0.48:

Aspirate \As"pi*rate\, v. t. [imp. & p. p. Aspirated; p. pr. &
   vb. n. Aspirating.] [L. aspiratus, p. p. of aspirare to
   breathe toward or upon, to add the breathing h; ad + spirare
   to breathe, blow. Cf. Aspire.]
   To pronounce with a breathing, an aspirate, or an h sound;
   as, we aspirate the words horse and house; to aspirate a
   vowel or a liquid consonant.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Aspirate \As"pi*rate\, n.
   1. A sound consisting of, or characterized by, a breath like
      the sound of h; the breathing h or a character
      representing such a sound; an aspirated sound.
      [1913 Webster]

   2. A mark of aspiration ([asper]) used in Greek; the asper,
      or rough breathing. --Bentley.
      [1913 Webster]

   3. An elementary sound produced by the breath alone; a surd,
      or nonvocal consonant; as, f, th in thin, etc.
      [1913 Webster] Aspirate

The Collaborative International Dictionary of English v.0.48:

Aspirate \As"pi*rate\ ([a^]s"p[i^]*r[asl]t), Aspirated
\As"pi*ra"ted\ (-r[=a]"t[e^]d), a. [L. aspiratus, p. p.]
   Pronounced with the h sound or with audible breath.
   [1913 Webster]

         But yet they are not aspirate, i. e., with such an
         aspiration as h.                         --Holder.
   [1913 Webster]

WordNet (r) 3.0 (2006):

aspirate
    n 1: a consonant pronounced with aspiration
    v 1: remove as if by suction; "aspirate the wound" [syn:
         aspirate, draw out, suck out]
    2: pronounce with aspiration; of stop sounds
    3: suck in (air)

Moby Thesaurus II by Grady Ward, 1.0:

23 Moby Thesaurus words for "aspirate":
   breathe, breathe in, coo, draw in, inhale, inspire, maffle, mumble,
   murmur, mussitate, mutter, sigh, slurp, sniff, sniffle, snuff,
   snuff in, snuffle, suck, suck in, suckle, susurrate, whisper