sill like


a horizontal timber, block, or the like serving as a foundation of a wall, house, etc.
the horizontal piece or member beneath a window, door, or other opening. See diag. under double-hung.
Geology. a tabular body of intrusive igneous rock, ordinarily between beds of sedimentary rocks or layers of volcanic ejecta.

before 900; Middle English sille, Old English syl, sylle; cognate with Low German süll, Old Norse syll; akin to German Schwelle sill

sill-like, adjective
undersill, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sill (sɪl)
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
[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 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

O.E. syll "beam, large timber serving as a foundation of a wall," from P.Gmc. *suljo (cf. O.N. svill "framework of a building," M.L.G. sull, O.H.G. swelli, Ger. Schwelle "sill"), perhaps from PIE base *swel- "post, board" (cf. Gk. selma "beam"). Meaning "lower horizontal part of a window opening" is
recorded from 1428.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
sill   (sĭl)  Pronunciation Key 
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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