Without scruples; immoral. / Contemptuous of what is right or honorable.

(volcanology, meteorology) Electrical discharge that occurs during a volcanic eruption, caused by a build-up of static electricity in colliding ejecta (such as ash and debris).

plural of air lock

(archaic) To shut away, confine, lock up. / (of a bird) To moult. / (of a bird, obsolete) To cause to moult. / (of a deer, obsolete) To shed antlers.