(physics) An instrument used to measure the refractive index of a liquid, by utilizing the critical angle for total reflection.

(usually capitalized) Soil that has a well-differentiated profile, with the three types or horizons of soil.

plural of abbot primate

A pouch on the abdomen of marsupials that covers the mammary glands; marsupium.

plural of abdominal region

Inspiration and expiration controlled by the diaphragm; diaphragmatic respiration.

plural of abdominal pouch

plural of abdominal fin

(ichthyology) A pair of sphincters near the cloaca that allow for communication between the abdominal cavity and the exterior.

(ichthyology) One of the posterior paired fins of fishes; pelvic fin; ventral fin.