sill

English Thesaurus

1. structural member consisting of a continuous horizontal timber forming the lowest member of a framework or supporting structure (noun.artifact)

hypernym	:	structural member,
definition	:	support that is a constituent part of any structure or building (noun.artifact)

hyponym	:	doorsill, doorstep, threshold,
definition	:	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 (noun.artifact)

hyponym	:	windowsill,
definition	:	the sill of a window; the horizontal member at the bottom of the window frame (noun.artifact)

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

hypernym	:	rock, stone,
definition	:	a lump or mass of hard consolidated mineral matter (noun.object)

domain category	:	geology,
definition	:	a science that deals with the history of the earth as recorded in rocks (noun.cognition)