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sill

[sil] /sɪl/
noun
1.
a horizontal timber, block, or the like serving as a foundation of a wall, house, etc.
2.
the horizontal piece or member beneath a window, door, or other opening.
3.
Geology. a tabular body of intrusive igneous rock, ordinarily between beds of sedimentary rocks or layers of volcanic ejecta.
Origin
900
before 900; Middle English sille, Old English syl, sylle; cognate with Low German süll, Old Norse syll; akin to German Schwelle sill
Related forms
sill-like, adjective
undersill, noun
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for sill like

sill

/sɪl/
noun
1.
a shelf at the bottom of a window inside a room
2.
a horizontal piece along the outside lower member of a window, that throws water clear of the wall below
3.
the lower horizontal member of a window or door frame
4.
a continuous horizontal member placed on top of a foundation wall in order to carry a timber framework
5.
a flat usually horizontal mass of igneous rock, situated between two layers of older sedimentary rock, that was formed by an intrusion of magma
Word Origin
Old English syll; related to Old Norse svill sill, Icelandic svoli tree trunk, Old High German swella sill, Latin solum ground
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
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Word Origin and History for sill like

sill

n.

Old English syll "beam, threshold, large timber serving as a foundation of a wall," from Proto-Germanic *suljo (cf. Old Norse svill, Swedish syll, Danish syld "framework of a building," Middle Low German sull, Old High German swelli, German Schwelle "sill"), perhaps from PIE root *swel- (3) "post, board" (cf. Greek selma "beam"). Meaning "lower horizontal part of a window opening" is recorded from early 15c.

Online Etymology Dictionary, © 2010 Douglas Harper
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sill like in Science
sill
  (sĭl)   
A sheet of igneous rock intruded between layers of older rock. See illustration at batholith.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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