Webster
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Webster’s Revised Unabridged Dictionary · 1913

Coupling

Coup′ling (-l?ng), n. 1. The act of bringing or coming together; connection; sexual union.

2. (Mach.) A device or contrivance which serves to couple or connect adjacent parts or objects; as, a belt coupling, which connects the ends of a belt; a car coupling, which connects the cars in a train; a shaft coupling, which connects the ends of shafts.

Box coupling, Chain coupling. See under Box, Chain. — Coupling box, a coupling shaped like a journal box, for clamping together the ends of two shafts, so that they may revolve together. — Coupling pin, a pin or bolt used in coupling or joining together railroad cars, etc.

Webster’s Revised Unabridged Dictionary, Noah Porter, editor (Springfield, Mass.: G. & C. Merriam, 1913). Public domain. Text as transcribed by MICRA, Inc., from Project Gutenberg. Changed for Deep Dive Bible: Greek, which our source spelled in Latin letters, set in Greek letters; entries of one spelling merged into one article; Greek words our source left out (shown as “?”), read from the 1898 printing, from the same plates (the Library of Congress’s copy), where the place could be found with certainty.