noun the mantle of a bird.
2. pallium ·noun the mantle of a bivalve. ·see mantle.
3. pallium ·noun a band of white wool, worn on the shoulders, with four purple crosses worked on it; a pall.
4. pallium ·noun a large, square, woolen cloak which enveloped the whole person, worn by the greeks and by certain romans. it is the roman name of a greek garment.