An instrument for demonstrating or measuring osmotic pressure.

An instrument for recording and measuring variation in the volume of a part of the body, or of the whole body, esp. as caused by changes in blood…

Biology. An apparatus that measures the rate of oxygen consumption or carbon dioxide generation by an organism, organic system, tissue, etc.

An instrument for determining the turbidity of a liquid from the decrease in the intensity of a beam of light passing through it.

Used attributively and in the possessive to denote apparatus for the study of the metabolism of small pieces of tissue by the manometric…

Biology. A device attached to or forming an animal's cage, the movement of which is recorded as a measure of the animal's activity.