ovoidal

The Rapakiwi granites of Finland have many round or ovoidal felspar crystals scattered through a granitic matrix.

It consists of a roundish or ovoidal ball, apparently of rock-crystal, about an inch and a half in diameter, and protected by a silver mounting.

There the cliffs diverging, and again coming near, enclose a valley of ovoidal shape, for the most part overgrown with pecan-trees.

The most ancient churches in Wales have circular or ovoidal churchyards—a form essentially Celtic—and it may well be that these sacred spots were dedicated to religious purposes in pagan times, and were appropriated by the early Christians,—not, perhaps, without opposition on the part of the adherents of the old faith—and consecrated to the use of the Christian religion. 

Their green rings, circular or ovoidal in form, abounded in all parts of the country, and it was in these circles they were said to dance through the livelong night.