sill

n.

1. The horizontal member that bears the upright portion of a frame, especially the horizontal member that forms the base of a window.
2. Geology. An approximately horizontal sheet of igneous rock intruded between older rock beds.

[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.

sill, 1

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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.

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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

Italiano (Italian)
soglia

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

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Window Sill Silk Flowers