(statistics) A measure of how spread out data values are around the mean, defined as the square root of the variance. Represented with the Greek letter σ (sigma).

(science fiction) A device which renders a person or thing invisible.

(computer hardware) An electronic device that is outside the computer's system unit (external to the computer's enclosing case), but used by the computer to which it is connected, such as a printer or a scanner.

Devilry.

A juggling prop consisting of two hand sticks (dowels) and a third larger, hourglass-shaped stick.

mischief. / Wickedness; cruelty. / An action performed with the help of a devil; witchcraft. / An act of such mischief, wickedness, cruelty, or witchcraft.

A contraceptive device consisting of a spiral or similar shape of plastic or metal inserted through the vagina into the uterus in order to prevent the implantation of a fertilized egg.

(literally) A female devil (as opposed to a he-devil, male devil). / (figuratively) A woman whose bad temper, cruelty or wicked ways are so extreme as to evoke an image of the devil.

Any device which generates or is powered by compressed air

Any device designed for use with or relating to the lungs, such as the iron lung and medical ventilator, or any device used in the field of respiratory therapy.