(i.e. body of Christ), a festival of the Church of Rome, observed on the first Thursday after Trinity Sunday, in honour of the eucharist. It was instituted by Pope Urban IV., A.D. 1264. Corpus Christi is also the name of one of the colleges of Oxford.

CORPUSCULE, in Physics, a minute particle, or physical atom, such as those of which a natural body is composed. This term is not applied to the elementary principles of matter, but to such particles, whether simple or compound, as are not dissolved or dissipated by ordinary degrees of heat.