noun
sill
sihl
noun
1
The horizontal ledge at the base of a window or door frame.
"She set the plant pot on the windowsill."
"Rain had rotted the wooden sill under the kitchen window."
2
(geology) A flat sheet of igneous rock that has forced its way between existing layers of rock underground.
"Geologists found a dolerite sill running beneath the hillside."
How to Use Sill
Learner’s notesIn plain EnglishThe ledge at the bottom of a window, or a flat underground rock layer in geology.
Common pairings
window sill
door sill
sill plate
Word Forms
more sill comparative, sills plural, sills plural, sills plural, Sills plural, most sill superlative
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Rain had rotted the wooden _____ under the kitchen window.
Etymology
From Old English syll, "threshold, foundation," related to Old Norse svill and, more distantly, to Latin silva, "forest."