Top Definition. pentacle. The pentacle is a five pointed star within a circle, the points representing the four elements (fire, water, earth & air) and ether (spirit) and the circle represents eternity as most pagans believe in the eight-fold year and the spiral dance.. pentacle. a star inside a circle a pentacle is a symbol that pagans and wiccians use. just like the christians have the cross of crusifix. christians usualy think it is a satanic symbol but it isn't. it is. christian: that is a satanic star.