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]

Moby Thesaurus II by Grady Ward, 1.0:

74 Moby Thesaurus words for "chivalrous":
   aristocratic, benevolent, big, bighearted, bold, bold-spirited,
   brave, ceremonious, charitable, chivalric, considerate, courageous,
   courteous, courtly, doughty, ducal, elevated, exalted, formal,
   gallant, generous, genteel, gentle, gentlemanlike, gentlemanly,
   gracious, great, great of heart, greathearted, handsome, hardy,
   heroic, herolike, high, high-minded, idealistic, intrepid,
   ironhearted, kind, kinglike, kingly, knightlike, knightly,
   ladylike, largehearted, liberal, lionhearted, lofty, magnanimous,
   manful, manly, noble, noble-minded, of gentle blood, of rank,
   old-fashioned, old-world, openhanded, patrician, polite,
   princelike, princely, queenlike, queenly, quite the lady,
   soldierlike, soldierly, stalwart, stout, stouthearted, sublime,
   titled, valiant, valorous