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derailleur a device on some bicycles that moves the chain onto various gears in order to allow easier or more difficult pedaling.
derange to cause to be mentally ill. [3 definitions]
deranged mentally ill; insane.
derby any of numerous horse races run every year and often restricted to three-year-old horses. [3 definitions]
deregulate to abolish regulations governing (something); decontrol.
derelict failing to fulfill one's responsibilities or obligations; remiss. [4 definitions]
dereliction deliberate failure to fulfill one's responsibilities or obligations. [2 definitions]
deride to ridicule or treat with scornful mockery.
de rigueur (French) required by fashion, custom, etiquette, or the like.
derision mockery or ridicule.
derisive ridiculing, mocking, or scoffing.
derivation the act, fact, or process of deriving or being derived. [4 definitions]
derivative produced through derivation. [4 definitions]
derive to obtain or extract from an original source (usu. fol. by from). [3 definitions]
-derm skin; covering; layer.
derma1 skin, esp. the true, living skin found beneath the epidermis; dermis.
derma2 in Jewish cooking, an intestinal membrane used to hold a bread stuffing for a dish called kishke.
dermatitis the medical condition of inflamed skin.
dermato- skin.
dermatoglyphics the patterns of skin ridges on the palm of the hand and sole of the foot. [2 definitions]
dermatology the branch of medicine concerned with skin and skin disease.