
[Middle English sille, from Old English syll, threshold.]
For more information on sill, visit Britannica.com.
An intrusion of igneous rock which spreads along bedding planes in a nearly horizontal sheet. This level sheet may be up to 300 m in thickness. The best-known British example is the Great Whin Sill, which runs across the Pennines.
1. A horizontal timber, at the bottom of the frame of a wood structure, which rests on the foundation.
2. A doorsill.
3. The horizontal bottom member of a window frame or other frame.
![]() |
A tabular, parallel-sided sheet of igneous rock, formed underground, that is parallel to the layered rocks around it.
An intrusive shet of lava that squeezed into sedimentary strata. The Palisades across the Hudson River from New York City are a good example. Also called a sheet.
LearnThatWord.com is a free vocabulary and spelling program where you only pay for results!

| Look up sill or sills in Wiktionary, the free dictionary. |
Sill may refer to:
| This disambiguation page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article. |
This entry is from Wikipedia, the leading user-contributed encyclopedia. It may not have been reviewed by professional editors (see full disclaimer)
Dansk (Danish)
n. - karm, tærskel, dørtrin
Nederlands (Dutch)
vensterbank, drempel
Français (French)
n. - seuil, rebord, appui, bas de caisse (d'une voiture)
Deutsch (German)
n. - Schwelle, Sims
Ελληνική (Greek)
n. - (οικοδ.) περβάζι, κατώφλι, αναβαθμός, στηθαίο, (γεωλ.) στρωματοειδής φλέβα
Português (Portuguese)
n. - peitoril (m) de janela, soleira (f) de porta
Русский (Russian)
наружный подоконник, порог, лежень, грязевой поток, сель
Español (Spanish)
n. - umbral, alféizar, solera
Svenska (Swedish)
n. - fönsterbräda, syll, bottenbjälke
中文(简体)(Chinese (Simplified))
基石, 窗台, 门槛
中文(繁體)(Chinese (Traditional))
n. - 基石, 窗臺, 門檻
한국어 (Korean)
n. - (기둥의) 토대, 문지방, (지질) 관입 암상
日本語 (Japanese)
n. - 窓敷居, 敷居, 土台
العربيه (Arabic)
(الاسم) عتبه ألباب أو ألنافذة
עברית (Hebrew)
n. - אדן-חלון, סף
If you are unable to view some languages clearly, click here.