
1) Anchor 2) Arch crown 3) Arch feature 4) Arch support 5) Architectural element 6) Backbone 7) Brass Era vehicle 8) Central wedge in top of arch 9) Essential principle 10) Exclusively Saxon word 11) Exclusively Anglo word 12) Famous movie cops 13) Kops of comedy 14) Linchpin 15) Lynchpin 16) Mainstay
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https://www.crosswordclues.com/clue/keystone

1) Backbone 2) Completion 3) Foundation 4) Headstone 5) Linchpin 6) Lynchpin
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https://www.crosswordclues.com/clue/keystone

the architectural piece at the crown of a vault or arch and marks its apex, locking the other pieces into position.
Found on
http://en.wikipedia.org/wiki/Glossary_of_architecture

• (n.) The central or topmost stone of an arch. This in some styles is made different in size from the other voussoirs, or projects, or is decorated with carving. See Illust. of Arch.
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http://thinkexist.com/dictionary/meaning/keystone/

Founded in 1912 when financing was received by Mack Sennett, Keystone Company began producing films in 1913. Five hundred films were made under the leadership of Sennett and included such stars as Charlie Chaplin, Chester Conklin, Fatty Arbuckle, and Buster Keaton. Though it did not survive the departure of Sennett in 1917 it became known for what ...
Found on
http://www.allmovie.com/glossary/term/keystone

(from the article `arch`) ...blocks are called voussoirs. Each voussoir must be precisely cut so that it presses firmly against the surface of neighbouring blocks and conducts ...
Found on
http://www.britannica.com/eb/a-z/k/25

central wedge shaped stone at the top of an arch
Found on
http://www.castles-of-britain.com/glossary.htm

Central wedge in top of arch.
Found on
http://www.castlesontheweb.com/glossary.html

The Keystone is the central wedge-shaped stone at the top of a curved arch that holds the arch in place. The keystone is also known as the central voussoir.
Found on
http://www.designbuild-network.com/glossary/keystone.html

Central wedge in top of arch.
Found on
http://www.encyclo.co.uk/local/20018

the central, locking stone in an arch made of voussoirs (q.v.)
Found on
http://www.encyclo.co.uk/local/20559

Final, or first stone, that is used to lock together a section of stonework, or provide a firm base stone e.g. in pitching or revetments.
Found on
http://www.encyclo.co.uk/local/20717

A form of video image distortion in which the top of the picture is wider than the bottom, or the left is taller than the right, or vice versa. The image is shaped like a trapezoid rather than a rectangle.
Found on
http://www.encyclo.co.uk/local/21058

In stonework the keystone is a central voussoir that is quite often decorated in some way. When the arch is being built it is always built up evenly from side to side and the last stone placed is the keystone.;
Found on
http://www.encyclo.co.uk/local/22188

The central wedge-shaped member of a masonry arch; also used as a decorative element on arches in wood structures.
Found on
http://www.encyclo.co.uk/local/22195

the architectural piece at the crown of a vault or arch and marks its apex, locking the other pieces into position.
Found on
http://www.encyclo.co.uk/local/22196

A stone cut the shape of a keystone in an arch. Keystones are usually step cut.
Found on
http://www.encyclo.co.uk/local/22290

(Learning Modules / Mathematics / Bridges) The 'keystone' is the central stone in an arch, and begins the distribution of the vertical 'load' forces down and around the arch. The keystone is the last voussoir to be placed in position, and allows each half of the arch to support the other.
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http://www.encyclo.co.uk/visitor-contributions.php

The central stone in the Roman arch
Found on
http://www.encyclo.co.uk/visitor-contributions.php
Key'stone` noun (Architecture) The central or topmost stone of an arch. This in some styles is made different in size from the other voussoirs, or projects, or is decorated with carving. See
Illust. of
Arch .
Keystone State ,
the State of Pennsylvania; - - so called fro...
Found on http://www.encyclo.co.uk/webster/K/7
In architecture a keystone is the central or topmost stone of an arch. This in some styles is made different in size from the other voussoirs, or projects, or is decorated with carving.
Found on http://www.probertencyclopaedia.com/browse/TK.HTM
Stone forming the top of an arch.
Found on http://www.translationdirectory.com/glossaries/glossary235.php
a central stone at the summit of an arch, locking the whole together.
Found on http://www.translationdirectory.com/glossaries/glossary336.php
Refers to the second base. Sometimes the shortstop and second baseman generally uniting on double plays are denoted as the keystone combination.
Found on https://www.888sport.com/blog/glossary-sports-terms/glossary-baseball-terms
key 3 headstone noun the central building block at the top of an arch or vault
Found on https://www.encyclo.co.uk/local/20974
No exact match found.