n. 椭圆形

a. 卵形的, 椭圆形的

[化] 椭圆形

[医] 卵圆的

Oval \O"val\, a. [F. ovale, fr. L. ovum egg. Cf. {Egg}, {Ovum}.]
1. Of or pertaining to eggs; done in the egg, or inception;
as, oval conceptions. [Obs.]

2. Having the figure of an egg; oblong and curvilinear, with
one end broader than the other, or with both ends of about
the same breadth; in popular usage, elliptical.

3. (Bot.) Broadly elliptical.

{Oval chuck} (Mech.), a lathe chuck so constructed that work
attached to it, and cut by the turning tool in the usual
manner, becomes of an oval form.


Oval \O"val\, n.
A body or figure in the shape of an egg, or popularly, of an
ellipse.

{Cassinian oval} (Geom.), the locus of a point the product of
whose distances from two fixed points is constant; -- so
called from Cassini, who first investigated the curve.
Thus, in the diagram, if P moves so that P A.P B is
constant, the point P describes a Cassinian oval. The
locus may consist of a single closed line, as shown by the
dotted line, or of two equal ovals about the points A and
B.