Oval : loosely used for a broadly elliptical shape. the width over 1/2 the length : some authors have used it as the same as ovate: 

Ovary : female organ of flower. situated in center of the flower and developing  into the fruit containing seeds. 

Ovate ; egg-shaped in outline. attached at the wide end. 

Ovoid : a 3 - dimensional figure. ovate in outline. 

Obconic: inversely conical. 

Oblanceolate: inversely lance- shaped. 

Oblique: a shape with half more large than the other; usually of leaf-bases. 

Oblong: longer than broad with sides nearly parallel. 

Obovate: reversed ovate shape. 

Obtuse: blunt ended. 

Orbicular: circular in outline. 

Ovary: the swollen or flask- shaped part of the pistil enclosing the ovules.