[ splahyn ]
/ splaɪn /


verb (used with object), splined, splin·ing. Machinery.

to provide with a spline or key.
to provide with a keyway.

Nearby words

  1. spleuchan,
  2. splice,
  3. splicer,
  4. splicing,
  5. spliff,
  6. splint,
  7. splint bone,
  8. splinter,
  9. splinter group,
  10. splintery

Origin of spline

1750–60; orig. East Anglian dial.; perhaps akin to splint; compare Old English splin spindle

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for splining


/ (splaɪn) /


any one of a series of narrow keys (external splines) formed longitudinally around the circumference of a shaft that fit into corresponding grooves (internal splines) in a mating part: used to prevent movement between two parts, esp in transmitting torque
a long narrow strip of wood, metal, etc; slat
a thin narrow strip made of wood, metal, or plastic fitted into a groove in the edge of a board, tile, etc, to connect it to another


(tr) to provide (a shaft, part, etc) with splines

Word Origin for spline

C18: East Anglian dialect; perhaps related to Old English splin spindle; see splint

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for splining



"long, thin piece of wood or metal," 1756, from East Anglian dialect, perhaps from older Danish splind or North Frisian splinj.

Online Etymology Dictionary, © 2010 Douglas Harper