a chest where the "hosts" are kept in the church, referring to crackers (symbolizing Christ's body) consumed in communion (see Molina; partly a loanword from Spanish, ostia, host)
a crossroads (this can have a metaphorical meaning) Gran Diccionario Náhuatl, citing A. Wimmer (2004), who draws from the Florentine Codex, Book 6, https://gdn.iib.unam.mx/diccionario/otlamaxalli/58576, with the translation here to English by SW.