sponsor

[Lat., from sponsus, pa. par. of spondeo to promise.] 1. A surety; one who binds himself to answer for another, and to be responsible for his default. 2. Specif .: One who is surety for an infant at baptism; a godfather or godmother. "William was one of the sponsors ."-Macaulay: Hist. Eng ., ch. xiv.