lunar
(Really? Ovoid? Or elliptical? That's strange. I can't usually use Google, 'cause it always thinks I'm a bot, and makes me do hundreds of "Prove you're a human" tests. But I couldn't find that definition in my other searches).
(Oh wait! I found it. Elliptical? Like a rowing machine. Weird. But I meant it in the sense: "having an oval shape").