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Orpin
n.
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The orpine.
Orpine
n.
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A low plant with fleshy leaves (Sedum telephium), having clusters of purple flowers. It is found on dry, sandy places, and on old walls, in England, and has become naturalized in America. Called also stonecrop, and live-forever.
Orrach
n.
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See Orach.
Orreries
pl.
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of Orrery
Orrery
n.
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An apparatus which illustrates, by the revolution of balls moved by wheelwork, the relative size, periodic motions, positions, orbits, etc., of bodies in the solar system.
Orris
n.
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A plant of the genus Iris (I. Florentina); a kind of flower-de-luce. Its rootstock has an odor resembling that of violets.
Orris
n.
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A sort of gold or silver lace.
Orris
n.
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A peculiar pattern in which gold lace or silver lace is worked; especially, one in which the edges are ornamented with conical figures placed at equal distances, with spots between them.
Orsedew
n.
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Alt. of Orsedue
Orsedue
n.
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Leaf metal of bronze; Dutch metal. See under Dutch.
Orseille
n.
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See Archil.
Orsellic
a.
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Pertaining to, or designating, an acid found in certain lichens, and called also lecanoric acid.
Orsellinic
a.
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Pertaining to, or designating, an organic acid obtained by a partial decomposition of orsellic acid as a white crystalline substance, and related to protocatechuic acid.
Orts
pl.
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of Ort
Ort
n.
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A morsel left at a meal; a fragment; refuse; -- commonly used in the plural.
Ortalidian
n.
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Any one of numerous small two-winged flies of the family Ortalidae. The larvae of many of these flies live in fruit; those of others produce galls on various plants.
Orthid
n.
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A brachiopod shell of the genus Orthis, and allied genera, of the family Orthidae.
Orthis
n.
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An extinct genus of Brachiopoda, abundant in the Paleozoic rocks.
Orthite
n.
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A variety of allanite occurring in slender prismatic crystals.
Ortho-
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A combining form signifying straight, right, upright, correct, regular; as, orthodromy, orthodiagonal, orthodox, orthographic.
Ortho-
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A combining form (also used adjectively)
Ortho-
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The one of several acids of the same element (as the phosphoric acids), which actually occurs with the greatest number of hydroxyl groups; as, orthophosphoric acid. Cf. Normal.
Ortho-
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Connection with, or affinity to, one variety of isomerism, characteristic of the benzene compounds; -- contrasted with meta- or para-; as, the ortho position; hence, designating any substance showing such isomerism; as, an ortho compound.
Orthocarbonic
a.
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Designating a complex ether, C.(OC2H5)4, which is obtained as a liquid of a pleasant ethereal odor by means of chlorpicrin, and is believed to be a derivative of the hypothetical normal carbonic acid, C.(OH)4.
Orthocenter
n.
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That point in which the three perpendiculars let fall from the angles of a triangle upon the opposite sides, or the sides produced, mutually intersect.
Orthoceras
n.
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An extinct genus of Paleozoic Cephalopoda, having a long, straight, conical shell. The interior is divided into numerous chambers by transverse septa.
Orthoceratite
n.
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An orthoceras; also, any fossil shell allied to Orthoceras.
Orthoclase
n.
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Common or potash feldspar crystallizing in the monoclinic system and having two cleavages at right angles to each other. See Feldspar.
Orthoclastic
a.
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Breaking in directions at right angles to each other; -- said of the monoclinic feldspars.
Orthodiagonal
n.
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The diagonal or lateral axis in a monoclinic crystal which is at right angles with the vertical axis.