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Synonyms for Prolate (same or very similar meaning)

WordNet sense 1 (having the polar diameter greater than the equatorial diameter):

WordNet sense 2 (rounded like an egg):
elliptic, elliptical, oval, ovate, ovoid, egg-shaped, oviform, oval-shaped

WordNet sense 3 (curving and somewhat round in shape rather than jagged):

From the ODE community, based on WordNetadd/edit