
1) Architectural element 2) French word used in English
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https://www.crosswordclues.com/clue/quatrefoil

In art, architecture, and traditional Christian symbolism, the quatrefoil is a type of decorative framework consisting of a symmetrical shape which forms the overall outline of four partially overlapping circles of the same diameter. The word quatrefoil means `four leaves`, from Latin quattuor, four, plus folium, a leaf.) and applies to general .....
Found on
http://en.wikipedia.org/wiki/Quatrefoil

Four-lobed.
Found on
http://great-castles.com/glossary.php

four-petalled flower; design or ornament with four flowers or leaves
Found on
http://phrontistery.info/q.html

• (n.) Same as Quarterfoil.
Found on
http://thinkexist.com/dictionary/meaning/quatrefoil/

An ornamental figure, which is divided into four foils, leaves or lobes.
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http://www.artisansofthevalley.com/comm_gloss3.html

a 4-lobed shape formed by cusping in tracery
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http://www.encyclo.co.uk/local/20559

A four lobed shape.
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http://www.encyclo.co.uk/local/20941

four sided
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http://www.encyclo.co.uk/local/22129

Four-lobed motif; usually in block shape.
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http://www.encyclo.co.uk/local/22196

A four lobed shape.
Found on
http://www.encyclo.co.uk/local/22200

Four-lobed motif; usually in block shape
Found on
http://www.encyclo.co.uk/local/22203

An ornamental form which has four lobes or foils. It may resemble a four-petaled flower.
Found on
http://www.pitt.edu/~medart/menuglossary/INDEX.HTM

four-pointed embroidered pattern stiched on to the top of a Marine officer's barracks cover, from the tradition of wearing it to be identified as friendly to Marine sharpshooters during boarding actions in the era of wooden sailing ships.
Found on
http://www.translationdirectory.com/glossaries/glossary119.htm

An form that has four lobes or foils, resembling a four-petaled flower. In architecture, a quatrefoil plan is a four lobed structure in which the walls represent four leaves or petals with a dome on top. It is a common plan in Armenian architecture. Also known as a tetraconch. Compare with: cinquefoil, hexafoil, octafoil, trefoil, triconch.
Found on
http://www.virtualani.org/glossary/index.htm

four sided
Found on
https://www.encyclo.co.uk/local/20402

a leaf composed of four leaflets. · a panellike ornament composed of four lobes, divided by cusps, radiating from a common center.
Found on
https://www.infoplease.com/dictionary/quatrefoil
No exact match found.