a squared building stone cut more or less true on all faces adjacent to those of other stones so as to permit very thin mortar joints.
such stones collectively.
masonry made of them.
Carpentry. a short stud between joists and sloping rafters, especially near the eaves.
verb (used with object)
to face with ashlars.
Also, ashler.

1325–75; Middle English ascheler < Middle French aissel(i)er < Latin axillāris, equivalent to axill(a) (axis board, plank, axis + -illa diminutive suffix) + -āris -ar1; cf. -ar2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ashlar or ashler (ˈæʃlə)
1.  a block of hewn stone with straight edges for use in building
2.  Also called: ashlar veneer a thin dressed stone with straight edges, used to face a wall
3.  masonry made of ashlar
[C14: from Old French aisselier crossbeam, from ais board, from Latin axis axletree; see axis1]
ashler or ashler
[C14: from Old French aisselier crossbeam, from ais board, from Latin axis axletree; see axis1]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 14c., "square stone for building or paving," from O.Fr. aiseler, from L. axillaris, from axilla, dim. of axis "board, plank," which probably is not the same axis that means "axle." The stone sense is peculiar to English.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The interior walls are rough-cut ashlar stone, which are dressed at the windows.
The ashlar stonework of the complex is of exceptionally good quality with the
  names of the buildings inscribed in the stonework.
Ashlar masonry laid in courses of stone set without continuous joints and laid
  up without drawn patterns.
On the main block, the stucco is scored to resemble coursed ashlar masonry.
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