Initialism of accidental death and dismemberment.

(role-playing games) Initialism of Advanced Dungeons & Dragons.

Initialism of application development and delivery.

(biochemistry) Any of a number of fat-soluble vitamins, required for normal bone development and that prevents rickets; can be manufactured in the skin on exposure to sunlight.

(insurance) Abbreviation of directors and officers.

(neologism, slang, Canada, US) An idiot or jerk; a general-purpose moderate insult.

(banking, business) Abbreviation of documents against payment, a trade agreement whereby shipping papers are released once the buyer has paid for the draft

plural of D-sub

Abbreviation of vitamin D.

(electronics) an electrical connector with two or more rows of pins or sockets surrounded by a D-shaped metal shield