A laser that operates by analogy with an electronic waterfall, with electrons cascading down a series of small steps emitting a photon at each step.

(mining) A site for mining stone, limestone, or slate.

(transitive) To obtain (or mine) stone by extraction from a quarry. / (figuratively, transitive) To extract or slowly obtain by long, tedious searching.

(uncountable, obsolete) A part of the entrails of a hunted animal, given to the hounds as a reward. / (uncountable) An animal, often a bird or mammal, which is hunted.

To secure prey; to prey, as a vulture or harpy.

A diamond-shaped tile or pane, often of glass or stone.

A southern-African subspecies of plains zebra, Equus quagga quagga, which went extinct in 1883. The upper parts of the animal were reddish brown, becoming paler behind and beneath, while the face, neck, and fore part of the body were marked by dark stripes.

(physics) In the Standard Model, an elementary subatomic particle that forms matter. They combine to form hadrons, such as protons and neutrons.

A soft creamy cheese, eaten throughout northern, central, eastern, and southeastern Europe as well as the Low Countries, very similar to cottage cheese except that it is usually not made with rennet.

(Falkland Islands, informal) The black-crowned night heron, Nycticorax nycticorax.