(electrical engineering) A rectifier which converts alternating current to direct current, using a cathode tube with a pool of liquid mercury. Now superseded by solid-state rectifiers.

Alternative form of great-circle arc

(geometry) a segment of a great circle

(fishing) A type of knot used to secure fishing line to the arbor of a fishing reel.

plural of arbor knot

A subfamily of extinct languages formerly spoken in southern Arabia and belonging to the Semitic family. / The abjad used to write these languages.

(history) Libya from the late 1970s to 2011.

(mathematics) the point elasticity of one variable with respect to another between two given points

An inhabitant of the Tigris-Euphrates marshlands in the south and east of Iraq or the Hoveyzieh marshes of southwest Iran. They include members of various different tribes and confederations.

A variety of Arabic that was spoken in the Emirate of Sicily.