sill

/sษชl/
noun
  1. 1

    (also window sill) A horizontal slat which forms the base of a window.

  2. 2

    A horizontal, structural member of a building near ground level on a foundation or pilings or lying on the ground in earth-fast construction and bearing the upright portion of a frame. Also called a ground plate, groundsill, sole, sole-plate, mudsill. An interrupted sill fits between posts instead of being below and supporting the posts in timber framing.

  3. 3

    A horizontal layer of igneous rock between older rock beds.

  4. 4

    A piece of timber across the bottom of a canal lock for the gates to shut against.

  5. 5

    A raised area at the base of the nasal aperture in the skull.

    โ€œthe nasal sillโ€

  6. 6

    The inner edge of the bottom of an embrasure.

noun
  1. 1

    A young herring.

noun
  1. 1

    The shaft or thill of a carriage.

Source: https://en.wiktionary.org/wiki/sill