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An obscuring of the light from one celestial body by the passage of another between it and the observer or between it and its source of illumination.

In epidemiology, an infection is endemic in a population or region when it persists there at a constant baseline level.

A species is extinct when it has no living members. 

Having the same amount or value.

The act of giving or taking one thing in return for another.

A protein that acts as a catalyst for a biological reaction.

(singular) A sense organ that reacts to light and allows vision.

The invisible boundary around a black hole past which nothing can escape the gravitational pull - not even light.

The euro is a unit of currency that is used by most member countries of the European Union.