Demoiselle \De`moi`selle"\, n. [F. See {Damsel}.] 1. A young lady; a damsel; a lady's maid. 2. (Zo["o]l.) The Numidian crane ({Anthropoides virgo}); -- so called on account of the grace and symmetry of its form and movements. 3. (Zo["o]l.) A beautiful, small dragon fly of the genus {Agrion}.