(military) A type of balloon that is employed as an aerial platform for intelligence gathering and artillery spotting.

(countable, medicine) A physician who is both an obstetrician and a gynecologist.

(chiefly UK) Race in which a competitor, traveling on foot, must overcome various physical challenges in the form of obstacles.

plural of observation balloon

Alternative form of participant observer

(social sciences) One doing participant observation.

(social sciences) A research methodology used in some social sciences to gain familiarity with a group of individuals and their practices through an intensive involvement, usually over an extended period of time.

A style of comedy based on observations about everyday life.

Alternative form of keep the Sabbath

Synonym of Sabbath-keeper