Meaning of “sill” in the English Dictionary

"sill" in American English

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sill noun (WINDOW BASE)

us /sɪl/ [ C ] a flat, horizontal piece, usually of wood, forming the base of the frame of a window:

She leaned on the sill and looked out through the open window.

sill noun (ROCK LAYER)

earth science /sɪl/ [ U ] a layer of rock that is created when hot melted rock forces itself into spaces between other rock, then cools and becomes solid

(Definition of “sill” from the Cambridge Academic Content Dictionary © Cambridge University Press)