圣体 is a Christian term, specifically from Catholicism and Orthodox traditions, referring to the Eucharist or Blessed Sacrament — the consecrated bread and wine believed to become the body and blood of Christ. You'll see it in religious contexts, often paired with the verb 领 (to receive) as in 领圣体 ('to receive Communion') or as part of compound terms like 圣体圣事 ('the sacrament of the Eucharist').