Mahadeva, mighty god, Hindu Puranic, is an important epithet of Shiva with three heads (two male and one female) signifying the three aspects–Aghora (right), Saumya (center), and Shakti (left). The attributes are the ax, bell, hook, mirror, noose, staff, sword, tree, and trident. This term is also identified as a manifestation of Shiva and one of the Ekadasarudras (eleven forms of Rudra). In northern India among the tribes including the Gonds, the expression Mahadeo (great god) is directed toward Shiva as the supreme deity. A.G.H.
Jordan, Michael, Encyclopedia of Gods, New York, Facts On File, Inc. 1993, p. 151