The Collaborative International Dictionary of English v.0.48:

Velar \Ve"lar\, a. [See Velum.]
   [1913 Webster]
   1. Of or pertaining to a velum; esp. (Anat.) of or pertaining
      to the soft palate.
      [1913 Webster]

   2. (Phon.) Having the place of articulation on the soft
      palate; guttural; as, the velar consonants, such as k and
      hard g.
      [1913 Webster]

WordNet (r) 3.0 (2006):

velar
    adj 1: of or relating to the velum
    2: produced with the back of the tongue touching or near the
       soft palate (as `k' in `cat' and `g' in `gun' and `ng' in
       `sing')
    n 1: a consonant produced with the back of the tongue touching
         or near the soft palate [syn: velar, velar consonant]