sill

noun \ ˈsil \
Updated on: 18 Apr 2018

Definition of sill

1 : a horizontal piece (such as a timber) that forms the lowest member or one of the lowest members of a framework or supporting structure: such as
a : the horizontal member at the base of a window
b : the threshold of a door
2 : a tabular body of igneous rock injected while molten between sedimentary or volcanic beds or along foliation planes of metamorphic rocks
3 : a submerged ridge at relatively shallow depth separating the basins of two bodies of water

Recent Examples of sill from the Web

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'sill.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

Origin and Etymology of sill

Middle English sille, from Old English syll; akin to Old High German swelli beam, threshold

Other Building Terms


SILL Defined for English Language Learners

sill

Definition of sill for English Language Learners

  • : the shelf at the bottom of a window frame

  • : a piece of wood, metal, or stone at the bottom of a doorframe

  • : the part of the frame of a car that is directly under its doors


SILL Defined for Kids

sill

noun \ ˈsil \

Definition of sill for Students

1 : a heavy horizontal piece (as of wood) that forms the bottom part of a window frame or a doorway
2 : a horizontal supporting piece at the base of a structure


Seen and Heard

What made you want to look up sill? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

a large number

Get Word of the Day daily email!

Test Your Vocabulary

Odd Habits and Quirks Quiz

  • image1926873504
  • Which of the following best describes an easily irritated person?
True or False

Test your knowledge - and maybe learn something along the way.

TAKE THE QUIZ
Dictionary Devil

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!