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in which the image to be viewed is formed by the refraction of light in passing through a convex lens.

an inverted position; as, the reversal of a rotating wheel; the reversal of objects by a convex lens.

A convex curve or arch cut in the edge of a sail to prevent chafing, or to secure a better fit. As sound as a roach Etym: [roach perhaps being a corruption of a F. roche a rock], perfectly sound.

Having a back like that of roach; -- said of a horse whose back a convex instead of a concave curve.

Cut flat on the reverse, and with a convex face formed of triangular facets in rows; -- said of diamonds and other precious stones. See Rose diamond, under Rose. Cf. Brilliant, n.

To make circular, spherical, or cylindrical; to give a round or convex figure to; as, to round a silver coin; to round the edges of anything. Worms with many feet, which round themselves into balls, are bred chiefly under logs of timber. Bacon. The figures on our modern medals are raised and rounded to a very great per…

A part, as a flange, which is hollowed out to fit upon a convex surface and serve as a means of attachment or support.

r the pivot of a capstan. Flying saucer, a type of Unidentified Flying Object, having a biconvex discoid shape; such objects are occasionally reported to have been sighted, but no example of one has been reliably shown to exist. They are believed by ufologists to originate in outer space, but they are generally presume…

A saber with a much curved blade having the edge on the convex side, -- in use among Mohammedans, esp., the Arabs and persians. [Written also cimeter, and scymetar.]

of nudibranchiate mollusks of the genus Doris and allied genera, having a smooth, thick, convex yellow body.

A large American holothurian (Lophothuria Fabricii) having a bright orange convex body covered with finely granulated scales. Its expanded tentacles are bright red.

Half lenticular or convex; imperfectly resembling a lens. Kirwan.

A convex lens of glass for producing heat by converging the sun's rays into a focus. "Lighting a cigar with a sunglass." Hawthorne.

A kind of molding, concave at the bottom and convex at the top; -- usually called an ogee.

d like a tongue; specifically (Bot.), linear or oblong, and fleshy, blunt at the end, and convex beneath; as, a tongue-shaped leaf.

inking glass, without a foot or stem; -- so called because originally it had a pointed or convex base, and could not be set down with any liquor in it, thus compelling the drinker to finish his measure.

n the upper deck of a steam cargo vessel having a rounded gunwale and sides curved inward convexly.

(Naut.) A convex deck at the bow or stern of a vessel, so made to shed the seas quickly.

ls rounded or swollen in the middle. (b) A bivalve shell in which the valves are strongly convex.

oduced by vibration of the vocal cords through their entire width and thickness, and with convex surfaces presented to each other. -- Head voice (Phon.), a kind of voice of high pitch and of a thin quality ascribed to resonance in the head; voice of the thin register; falsetto. In producing it, the vibration of the co…