(economics) A sector of a nation's economy that is illegally undeclared and undocumented due to cash payments or tax avoidance

(sociology) Concerning the economics of human sexuality.

A type of hypertrophy where the walls and chamber of a hollow organ undergo growth in which the overall size and volume are increased.

A neutral endopeptidase inhibitor, the (S)-enantiomer of racecadotril.

(pharmacology) A vitamin D analogue.

An antiulcer drug.

An antiulcer and protease inhibitor.

(astronomy, celestial mechanics) The angle PCR formed by P = the periapsis of a celestial body's elliptical orbit, C = the center of that elliptical orbit, and R = the corresponding point to that celestial body (the projection of the celestial body along a direction parallel to the minor axis of its orbit onto the auxiliary circle (a circle which shares a diameter with the major axis of the celestial body's orbit)).

A sonar device used for echo sounding

(law) Abbreviation of economic. / (law) Abbreviation of economics. / (law) Abbreviation of economical. / (law) Abbreviation of economy.