nacelle: a streamlined enclosure for an aircraft engine
enclosure: a structure consisting of an area that has been enclosed for some purpose
answer: the principal pleading by the defendant in response to plaintiff's complaint; in criminal law it consists of the defendant's plea of `guilty' or `not guilty' (or nolo contendere); in civil law it must contain denials of all allegations in the plaintiff's complaint that the defendant hopes to controvert and it can contain affirmative defenses or counterclaims