sill
UK: sɪl | US: sɪl
n. a horizontal piece at the base of a window or door frame
n. (Geology) a sheet of igneous rock intruded between older rock layers
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Derived from Old English syll or syl, meaning "threshold" or "base." The word has Germanic roots (cf. Old Norse syll, German Schwelle) and originally referred to the foundational beam of a structure. Its geological sense emerged in the 19th century, metaphorically extending the idea of a foundational layer to rock formations.
She leaned against the window sill, gazing at the garden.
The cat curled up on the sill to bask in the sunlight.
The geologist identified a volcanic sill in the cliff face.
Rainwater pooled on the sill after the storm.
The old house had wooden sills weathered by time.