| side | (noun) an extended outer surface of an object | - |
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| (noun) either the left or right half of a body | - |
| (noun) an aspect of something (as contrasted with some other implied aspect) | - |
| (noun) an opinion that is held in opposition to another in an argument or dispute | Synonyms: position |
| (noun) (sports) the spin given to a ball by striking it on one side or releasing it with a sharp twist | Synonyms: English |
| (noun) a lengthwise dressed half of an animal's carcass used for food | Synonyms: side of meat |
| (noun) one of two or more contesting groups | - |
| (noun) a family line of descent | - |
| (noun) a surface forming part of the outside of an object | Synonyms: face |
| (noun) a line segment forming part of the perimeter of a plane figure | - |
| (noun) a place within a region identified relative to a center or reference location | - |
| (noun) an elevated geological formation | Synonyms: incline, slope |
| sidebar | (noun) (law) a courtroom conference between the lawyers and the judge that is held out of the jury's hearing | - |
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| (noun) a short news story presenting sidelights on a major story | - |
| sideboard | (noun) a piece of furniture that stands at the side of a dining room; has shelves and drawers | Synonyms: buffet, counter |
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| (noun) a board that forms part of the side of a bed or crib | - |
| (noun) a removable board fitted on the side of a wagon to increase its capacity | - |
| sideboob | (noun) A breast exposed from the side | - |
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| sideburn | (noun) facial hair that has grown down the side of a man's face in front of the ears (especially when the rest of the beard is shaved off) | Synonyms: burnside, mutton chop, side-whiskers |
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| sidecar | (noun) conveyance consisting of a small carrier attached to the side of a motorcycle | - |
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| (noun) a cocktail made of orange liqueur with lemon juice and brandy | - |
| sidekick | (noun) a close friend who accompanies his buddies in their activities | Synonyms: brother, buddy, chum, crony, pal |
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| sidelight | (noun) light carried by a boat that indicates the boat's direction; vessels at night carry a red light on the port bow and a green light on the starboard bow | Synonyms: running light |
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| sideline | (noun) an auxiliary activity | Synonyms: avocation, by-line, hobby, pursuit, spare-time activity |
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| (noun) an auxiliary line of merchandise | - |
| (noun) a line that marks the side boundary of a playing field | Synonyms: out of bounds |
| siderite | (noun) a meteorite consisting principally of nickel and iron | - |
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| (noun) iron ore in the form of ferrous carbonate | Synonyms: chalybite |
| sideroblast | (noun) an erythroblast having granules of ferritin | - |
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| siderocyte | (noun) an abnormal red blood cell containing granules of iron not bound in hemoglobin | - |
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| sideropenia | (noun) a deficiency of iron; results from inadequate iron in the diet or from hemorrhage | - |
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| siderophilin | (noun) a globulin in blood plasma that carries iron | Synonyms: beta globulin, transferrin |
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| siderosis | (noun) fibrosis of the lung caused by iron dust; occurs among welders and other metal workers | - |
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| sidesaddle | (noun) a saddle for a woman; rider sits with both feet on the same side of the horse | - |
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| sideshow | (noun) a minor show that is part of a larger one (as at the circus) | - |
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| (noun) a subordinate incident of little importance relative to the main event | - |
| sideslip | (noun) an unexpected slide | Synonyms: skid, slip |
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| (noun) a flight maneuver; aircraft slides sideways in the air | Synonyms: slip |
| sidesman | (noun) (Church of England) an assistant to the churchwarden; collects offerings of money in the church | - |
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| sidesplitter | (noun) a joke that seems extremely funny | Synonyms: belly laugh, howler, riot, scream, thigh-slapper, wow |
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| sidestep | (noun) a step to one side (as in boxing or dancing) | - |
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| sidestroke | (noun) a swimming stroke in which the arms move forward and backward while the legs do a scissors kick | - |
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| sideswipe | (noun) a glancing blow from or on the side of something (especially motor vehicles) | - |
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| sidetrack | (noun) a short stretch of railroad track used to store rolling stock or enable trains on the same line to pass | Synonyms: railroad siding, siding, turnout |
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| sidewalk | (noun) walk consisting of a paved area for pedestrians; usually beside a street or roadway | Synonyms: pavement |
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| sidewall | (noun) a wall that forms the side of a structure | - |
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| (noun) the side of an automobile tire | - |
| sidewinder | (noun) small pale-colored desert rattlesnake of southwestern United States; body moves in an s-shaped curve | Synonyms: Crotalus cerastes, horned rattlesnake |
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| (noun) air-to-air missile with infrared homing device | - |