ovoid adj : rounded like an egg [syn: egg-shaped, elliptic, elliptical, oval, ovate, oviform, prolate] n : an egg-shaped object

Ovoid \O"void\, Ovoidal \O*void"al\, a. [Ovum + -oid: cf. F. ovo["i]de.] Resembling an egg in shape; egg-shaped; ovate; as, an ovoidal apple.

Ovoid \O"void\, n. A solid resembling an egg in shape.

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In technical drawing, an oval (from Latin ovum, 'egg') is a figure constructed from two pairs of arcs, with two different radii (see image on the right). The arcs are joined at a point, in which lines tangential to both joining arcs lie on the same line, thus making the joint smooth. Any point of an oval belongs to an arc with a constant radius (shorter or longer), whereas in an ellipse the radius is continuously changing.

In geometry, an oval or ovoid is any curve resembling an egg or an ellipse, but not an ellipse. Unlike other curves, the term 'oval' is not well-defined and many distinct curves are commonly called ovals. These curves have in common that:

The word ovoidal refers to the characteristic of being an ovoid. An ovoid is the surface generated by rotating an oval curve about one of its axes of symmetry.

• Martian meteorite expected to bring $160,000+ to lead natural history selection at Heritage Auctions
  Meteorites from Mars are among the most exotic substances on Earth with less than 300 pounds known to exist. DALLAS, TX .- A large end section of a Martian meteorite, packed with olivine and chromite ovoid crystals, is expected to bring $160,000+ as part of Heritage Auctions ' Nature & Science Signature® Auction June 2 in Dallas. Read more on this news related to 'Ovoid'