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side by side next to each other.
sidecar a small, open, one-passenger car supported by a wheel at one side and attached to a motorcycle at the other. [2 definitions]
side chair an armless chair, usu. one of a set of such chairs for a dining table.
side check a checkrein that attaches to the bit and extends from the side of a horse's head to the saddle.
sided having sides of a specified material, number, or quality (usu. used in combination).
side dish a portion of food, often vegetables, that accompanies the main course.
sidekick (informal) a friend; pal. [2 definitions]
sidelight light coming from, or a light placed on, the side. [3 definitions]
sideline a line at the side of an area; lateral boundary, as of a playing field. [2 definitions]
sidelong directed to one side, as a motion or glance. [5 definitions]
sideman a musician, esp. in a jazz band, who provides backup to a soloist.
sidepiece a piece that forms all or part of a side of something.
sidereal of or pertaining to the stars. [2 definitions]
sidereal day a unit of time equal to the time required for one rotation of the earth; twenty-three hours, fifty-six minutes, and 4.1 seconds.
sidereal month the time required for one complete revolution of the moon around the earth with respect to a fixed star, or about 27.3 days in mean solar time.
sidereal time time based upon the rotation and revolution of the earth with reference to the background of stars.
sidereal year a unit of time equal to the time required for one revolution of the earth around the sun; 365 days, six hours, nine minutes, and 9.54 seconds.
siderite a yellowish to light-brown impure iron ore; iron carbonate. [2 definitions]
siderosis a disease or chronic inflammation of the lungs caused by the inhalation of metallic particles.
sidesaddle a saddle that permits the rider to ride with both legs on one side of the horse. [2 definitions]
sideshow a small exhibition offered to supplement the main attraction, as at a circus. [3 definitions]