sill

Noun
  1. Structural member consisting of a continuous horizontal timber forming the lowest member of a framework or supporting structure (synset 104227103)
    is a type of: structural member - support that is a constituent part of any structure or building
    subtypes:
    • doorsill, doorstep, threshold - the sill of a door; a horizontal piece of wood or stone that forms the bottom of a doorway and offers support when passing through a doorway
    • windowsill - the sill of a window; the horizontal member at the bottom of the window frame
  2. (geology) a flat (usually horizontal) mass of igneous rock between two layers of older sedimentary rock (synset 109458136)
    referred to in: geology - a science that deals with the history of the earth as recorded in rocks
    is a type of: rock, stone - a lump or mass of hard consolidated mineral matter

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