| arc | | |
| n. (phenomenon) | 1. arc, discharge, electric arc, electric discharge, spark | electrical conduction through a gas in an applied electric field. |
| ~ brush discharge | discharge between electrodes creating visible streamers of ionized particles. |
| ~ corona discharge, corposant, electric glow, saint elmo's fire, saint elmo's light, saint ulmo's fire, saint ulmo's light, st. elmo's fire, corona | an electrical discharge accompanied by ionization of surrounding atmosphere. |
| ~ flashover | an unintended electric discharge (as over or around an insulator). |
| ~ electrical conduction | the passage of electricity through a conductor. |
| n. (shape) | 2. arc | a continuous portion of a circle. |
| ~ limb | the graduated arc that is attached to an instrument for measuring angles.; "the limb of the sextant" |
| ~ curve, curved shape | the trace of a point whose direction of motion changes. |
| ~ circle | ellipse in which the two axes are of equal length; a plane curve generated by one point moving at a constant distance from a fixed point.; "he calculated the circumference of the circle" |
| ~ sector | a plane figure bounded by two radii and the included arc of a circle. |
| n. (shape) | 3. arc, bow | something curved in shape. |
| ~ rainbow | an arc of colored light in the sky caused by refraction of the sun's rays by rain. |
| ~ curve, curved shape | the trace of a point whose direction of motion changes. |
| v. (motion) | 4. arc, arch, curve | form an arch or curve.; "her back arches"; "her hips curve nicely" |
| ~ camber | curve upward in the middle. |
| ~ bend, flex | form a curve.; "The stick does not bend" |
| arch | | |
| n. (shape) | 1. arch | a curved shape in the vertical plane that spans an opening. |
| ~ curve, curved shape | the trace of a point whose direction of motion changes. |
| n. (body) | 2. arch | a curved bony structure supporting or enclosing organs (especially the inner sides of the feet). |
| ~ metatarsal arch | the short lateral arch formed by the heads of the metatarsals. |
| ~ instep | the arch of the foot. |
| ~ skeletal structure | any structure created by the skeleton of an organism. |
| ~ pectoral arch, shoulder girdle | the bony arch formed by the collarbones and shoulder blades in humans. |
| ~ haemal arch, hemal arch | a structure arising ventrally from a vertebral centrum and enclosing the caudal blood vessels. |
| ~ neural arch, vertebral arch | a structure arising dorsally from a vertebral centrum and enclosing the spinal cord. |
| n. (artifact) | 3. arch, archway | a passageway under a curved masonry construction.; "they built a triumphal arch to memorialize their victory" |
| ~ entrance, entranceway, entryway, entree, entry | something that provides access (to get in or get out).; "they waited at the entrance to the garden"; "beggars waited just outside the entryway to the cathedral" |
| ~ wall | an architectural partition with a height and length greater than its thickness; used to divide or enclose an area or to support another structure.; "the south wall had a small window"; "the walls were covered with pictures" |
| n. (artifact) | 4. arch | (architecture) a masonry construction (usually curved) for spanning an opening and supporting the weight above it. |
| ~ abutment arch | an arch supported by an abutment. |
| ~ aqueduct | a conduit that resembles a bridge but carries water over a valley. |
| ~ arcade, colonnade | a structure composed of a series of arches supported by columns. |
| ~ bridge, span | a structure that allows people or vehicles to cross an obstacle such as a river or canal or railway etc.. |
| ~ broken arch | an arch with a gap at the apex; the gap is usually filled with some decoration. |
| ~ camber arch | an arch with a straight horizontal extrados and a slightly arched intrados. |
| ~ corbel arch | (architecture) an arch constructed of masonry courses that are corbelled until they meet. |
| ~ flat arch, straight arch | an arch with mutually supporting voussoirs that has a straight horizontal extrados and intrados. |
| ~ headstone, keystone, key | the central building block at the top of an arch or vault. |
| ~ pier arch | an arch supported on piers. |
| ~ pointed arch | an arch with a pointed apex; characteristic of Gothic architecture. |
| ~ proscenium arch | the arch over the opening in the proscenium wall. |
| ~ rampant arch | an arch whose support is higher on one side than on the other. |
| ~ round arch | an arch formed in a continuous curve; characteristic of Roman architecture. |
| ~ rowlock arch | an arch that is formed with more than one concentric row of voussoirs. |
| ~ safety arch | an undecorated arch that is included in order to strengthen or support a construction. |
| ~ scoinson arch, sconcheon arch | an arch that supports part of the wall. |
| ~ segmental arch | a shallow arch; an arch that is less than a semicircle. |
| ~ shouldered arch | an arch consisting of a horizontal lintel supported at each end by corbels that project into the aperture. |
| ~ diminished arch, scheme arch, skeen arch, skene arch | an arch whose height is less than half its width. |
| ~ skew arch | an arch whose jambs are not at right angles with the face. |
| ~ springer, impost | the lowest stone in an arch -- from which it springs. |
| ~ squinch | a small arch built across the interior angle of two walls (usually to support a spire). |
| ~ structure, construction | a thing constructed; a complex entity constructed of many parts.; "the structure consisted of a series of arches"; "she wore her hair in an amazing construction of whirls and ribbons" |
| ~ trimmer arch | an arch built between trimmers in a floor (to support the weight of a hearth). |
| ~ triumphal arch | a monumental archway; usually they are built to commemorate some notable victory. |
| ~ four-centered arch, tudor arch | a low elliptical or pointed arch; usually drawn from four centers. |
| ~ voussoir | wedge-shaped stone building block used in constructing an arch or vault. |
| ~ architecture | the discipline dealing with the principles of design and construction and ornamentation of fine buildings.; "architecture and eloquence are mixed arts whose end is sometimes beauty and sometimes use" |
| adj. | 5. arch, condescending, patronising, patronizing | (used of behavior or attitude) characteristic of those who treat others with condescension. |
| ~ superior | of or characteristic of high rank or importance.; "a superior ruler" |
| adj. | 6. arch | expert in skulduggery.; "an arch criminal" |
| ~ skilled | having or showing or requiring special skill.; "only the most skilled gymnasts make an Olympic team"; "a skilled surgeon has many years of training and experience"; "a skilled reconstruction of her damaged elbow"; "a skilled trade" |
| adj. | 7. arch, impish, implike, mischievous, pixilated, prankish, puckish, wicked | naughtily or annoyingly playful.; "teasing and worrying with impish laughter"; "a wicked prank" |
| ~ playful | full of fun and high spirits.; "playful children just let loose from school" |
| crescent | | |
| n. (shape) | 1. crescent | any shape resembling the curved shape of the moon in its first or last quarters. |
| ~ curve, curved shape | the trace of a point whose direction of motion changes. |
| adj. | 2. crescent, crescent-shaped, lunate, semilunar | resembling the new moon in shape. |
| ~ rounded | curving and somewhat round in shape rather than jagged.; "low rounded hills"; "rounded shoulders" |
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