in physics, the metric unit of force, 1873, from a specialized scientific use of of Greek dynamis "power" (see dynamic (adj.)); perhaps also influenced by French dyne, which had been proposed c. 1842 as a unit of force in a different sense.
Chinese unit of currency introduced 1914, from Chinese yuan "round, round object, circle."
unit of illumination, 1889, from Latin lux "light," from PIE root *leuk- "light, brightness."
unit of the metric system for solid measure, 1798, from French stère "unit of volume equal to one cubic meter," from Greek stereos "solid, stiff, firm" (from PIE root *ster- (1) "stiff"). Little used, cubic meter generally serving instead.
Japanese monetary unit, 1875, from Japanese yen, from Chinese yuan "round, round object, circle, dollar."
Progress in science and industry is constantly demanding new terms and one of the latest of these is the word "decibel," coined by telephone engineers to describe the efficiency of telephone circuits. It is a substitute for the phrase "transmission unit." The actual unit decided upon was first called "bel," after the inventor of the telephone. The bel, however, is larger than is needed in practice, and, therefore, a unit one-tenth as large was adopted by engineers and named the decibel. [Popular Mechanics, May 1929]