Source : Webster's Revised Unabridged Dictionary (1913)

Cockspur \Cock"spur\, n. (Bot.)
   A variety of {Crat[ae]gus}, or hawthorn ({C. Crus-galli}),
   having long, straight thorns; -- called also {Cockspur
   thorn}.

Source : WordNet®

cockspur
     n 1: widely grown stout Old World hay and pasture grass [syn: {orchard
          grass}, {cocksfoot}, {Dactylis glomerata}]
     2: small spiny West Indian tree [syn: {Pisonia aculeata}]