Webster's English Dictionary

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crusade

1. cru.sade \kru:-'sa-d\ n [blend of MF croisade & Sp cruzada; both derivs. 
   of L cruc-,]crux cross cap  1: any of the military expeditions undertaken 
   by Christian powers in the 11 th, 12th, and 13th centuries to recover the 
   Holy Land from the Muslims 2: any remedial enterprise undertaken with zeal 
   and enthusiasm 
2. crusade vi : to engage in a crusade  - cru.sad.er n