The term 'not quite spherical' can be described by three crossword solutions: OVIFORM (7 letters), OVOID (5 letters), and oblate (6 letters). OVIFORM is a shape that is egg-like, but not quite round. An OVOID is an egg-shaped object that is slightly elongated. Lastly, an oblate is a shape that is flattened at the poles, like a sphere that has been squashed. All three of these shapes are not quite spherical, but they all have some similarities to a sphere.