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2. (Mech.) A curved sheath or
breasting for a revolving cylinder or roll.

Con"cave, v. t. [imp. & p.
p. concaved (&?;); p. pr. & vb.
n. Concaving.] To make hollow or
concave.

Con"caved (?), a. (Her.)
Bowed in the form of an arch; -- called also
arched.

Con"cave*ness, n. Hollowness;
concavity.

Con*cav"i*ty (?), n.; pl.
Concavities (#). [L. concavitas: cf. F.
concavité. See Concave.] A concave
surface, or the space bounded by it; the state of being
concave.

Con*ca`vo-con"cave (?), a.
Concave or hollow on both sides; double concave.

Con*ca`vo-con"vex (?), a.
1. Concave on one side and convex on the
other, as an eggshell or a crescent.

2. (Optics) Specifically, having
such a combination of concave and convex sides as makes the focal
axis the shortest line between them. See Illust. under
Lens.

Con*ca*"vous (?), a.


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