present participle of observe

observation

(mineralogy) A type of naturally occurring black glass produced by volcanoes. / A slightly bluish black, the color of obsidian glass.

(poetic) black

Alternative form of obstetric

(meteorology) A method of winds-aloft observation, temperature, and relative humidity of the upper that is, the determination of wind speeds and air and to automatically transmit that directions in the atmosphere above a station. This is done by reading the elevation and azimuth angles of a theodolite (instrument) observation while visually tracking a pilot balloon. The ascension rate of the balloon is approximately determined by careful inflation to a given total lift. After release from the ground, periodic readings (usually at one-minute intervals) of elevation and azimuth angles of the balloon are recorded. These data are transferred to a winds-aloft plotting board, and wind speed and direction at selected levels are calculated by trigonometric methods.

plural of obscenity

Relating to observation, especially scientific observation.

An area of a tall building, often open to the sky, from which the public may look at the surrounding panorama. / A building (such as a hide) from which people may observe wildlife.

(pathology) Any of a group of diseases characterized by the pathological limitation of airflow in the airway that is not fully reversible. May be caused by reactive airways, chronic infection, congenital defects, or, most commonly, cigarette smoking. Generally does not include neoplasms, which could also obstruct airways.