The Collaborative International Dictionary of English v.0.48:

Chivalrous \Chiv"al*rous\, a. [OF. chevalerus, chevalereus, fr.
   chevalier. See Chivalry.]
   Pertaining to chivalry or knight-errantry; warlike; heroic;
   gallant; high-spirited; high-minded; magnanimous.
   [1913 Webster]

         In brave pursuit of chivalrous emprise.  --Spenser.
   [1913 Webster]

WordNet (r) 3.0 (2006):

chivalrous
    adj 1: being attentive to women like an ideal knight [syn:
           chivalrous, gallant, knightly]