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decompress to reduce pressure or compression on. [3 definitions]
decompression the act or process of decompressing or being decompressed, as in deep-sea diving. [2 definitions]
decompression sickness a painful and sometimes fatal condition caused by the formation of nitrogen bubbles in the blood, resulting from returning to atmospheric pressure too quickly from deep water or a compression chamber; aeroembolism; bends.
decongestant a medical agent that reduces congestion, as in sinuses or nasal passages.
decontaminate to clear of impurities or dangerous substances; remove contaminants from. [2 definitions]
decontrol to eliminate control over (something), esp. government control; deregulate. [2 definitions]
décor the style, furnishings, or decorative scheme of a room, building, or the like. [2 definitions]
decorate to make more attractive or interesting by adding ornamental items or designs. [5 definitions]
decoration an act, process, or technique of decorating. [3 definitions]
decorative adding to visual attractiveness; ornamental.
decorator a person who decorates, esp. one whose occupation is designing interior décors.
decorous proper or formal with respect to behavior, manners, appearance, or the like.
decorticate to husk, debark, or peel. [2 definitions]
decorum properness of behavior, manner, appearance, or the like; dignity; propriety.
decoupage the technique of decorating something with cut-out pictures on paper or other material, covered by a flat finish or varnish. [3 definitions]
decoy something or someone used to lure, entice, or misdirect, as into danger or a trap, esp. an artificial bird or animal used to lure live birds or animals within gunshot or into a trap. [3 definitions]
decrease to become less in number, amount, size, strength, or the like; diminish. [4 definitions]
decree an official and authoritative order or decision, esp. by a ruler or government. [3 definitions]
decrement the act or process of gradually decreasing or lessening. [2 definitions]
decrepit in a poor condition because of old age or much use; dilapidated; worn-out.
decrepitude a weakened, feeble, or dilapidated condition, esp. owing to long use or old age.