sill

Definition of Sill in English :

1. sill

structural member consisting of a continuous horizontal timber forming the lowest member of a framework or supporting structure

2. sill

(geology) a flat (usually horizontal) mass of igneous rock between two layers of older sedimentary rock

WordNet Lexical Database for English. Princeton University. 2010.

Sill

noun

1.

a shelf at the bottom of a window inside a room

2.

a horizontal piece along the outside lower member of a window, that throws water clear of the wall below

3.

the lower horizontal member of a window or door frame

4.

a continuous horizontal member placed on top of a foundation wall in order to carry a timber framework

5.

a flat usually horizontal mass of igneous rock, situated between two layers of older sedimentary rock, that was formed by an intrusion of magma

noun

1.

a heavy, horizontal timber or line of masonry supporting a house wall, etc.

2.

a horizontal piece forming the bottom frame of the opening into which a window or door is set

3. Geology

a flattened piece of igneous rock forced between beds of stratified rocks

n.

1.

a. A horizontal member that bears the upright portion of a frame.

b. A windowsill.

2. Geology A sheet of igneous rock formed by the intrusion of magma between existing strata.