Ma'anar ƙamus na kalmar "yaro bagadi" yana nufin yaro ko matashi wanda ke taimakon firist a lokacin bukukuwa da hidima na addini, musamman a cikin Cocin Roman Katolika da na Anglican. Yaran Altar yawanci suna yin ayyuka dabam-dabam, kamar ɗaukar gicciye, riƙe da littafin liturgical na firist, da kuma taimakawa wajen shirya bagadi da tasoshi masu tsarki.
