The Collaborative International Dictionary of English v.0.48:

Unguent \Un"guent\ (?; 277), n. [L. unguentum, from unguere,
   ungere, to anoint: cf. F. onguent. See Ointment, and cf.
   Unction, Unctuous.]
   A lubricant or salve for sores, burns, or the like; an
   ointment. --Cowper.
   [1913 Webster]

   Note: An unguent is stiffer than a liniment, but softer than
         a cerate.
         [1913 Webster]

WordNet (r) 3.0 (2006):

unguent
    n 1: semisolid preparation (usually containing a medicine)
         applied externally as a remedy or for soothing an
         irritation [syn: ointment, unction, unguent, balm,
         salve]