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In geology, a sill is a tabular mass of igneous rock that has been intruded laterally between layers of sedimentary rock, beds of volcanic lava or tuff, or even along the direction of the foliation in metamorphic rock. The term "sill" is synonymous with "intrusive sheet."
See also: Dike
In architecture, a sill is the bottom edge of a window.
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The Sill River is a tributary to the Inn River, merging with it in Innsbruck, Tyrol, Austria.
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