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bacitracin an antibiotic that is used externally in the treatment of skin infections.
back the part of a human or other vertebrate that is on the opposite side from the chest and abdomen and between the neck and the tailbone. [15 definitions]
backache a pain in the back, esp. a persistent one in the lower back.
back and forth moving backward then forward, or forward then backward, often repeatedly. [2 definitions]
backbeat a primary accent on the second and fourth beats of a four-beat measure, common in popular music; secondary beat.
backbencher a junior legislator, esp. in Great Britain's House of Commons, who is not one of his or her party's leaders.
backbite to criticize harshly or speak badly of (an absent person).
backboard a board at the rear of something, serving as a support. [2 definitions]
backbone the series of bones that run along the center of the back; spinal column; vertebrae. [3 definitions]
backbreaking requiring exceptional physical effort; exhausting.
back burner a state of temporary low priority (usu. prec. by "on the").
backcheck in hockey, to check (an opposing player) in the vicinity of one's own goal. (Cf. forecheck.)
backcourt in basketball, the half of the court that a team is defending. (Cf. forecourt.) [3 definitions]
backdate to mark with a date that is prior to the actual date; predate.
backdoor done in secret; surreptitious.
backdrop a curtain at the rear of a stage setting, upon which are painted elements of the setting such as windows, furniture, the sky, or the like. [2 definitions]
backed having a back or support (often used in combination).
backer someone who supports or gives time or money to a business, a cause, or the like.
backfield in football, those offensive players whose position is behind the line, or those defensive players whose position is behind the linebackers. [2 definitions]
backfill to refill with what was previously removed. [2 definitions]
backfire to emit a loud noise as the result of inefficient functioning of the engine of a car or other internal-combustion vehicle. [4 definitions]