culet

[kyoo-lit]
noun
1.
Jewelry. a small face forming the bottom of a faceted gem.
2.
Armor. a piece below the backplate, composed of lames and correspondingto the fauld in front.

Origin:
1670–80; < French (obsolete), equivalent to cul bottom (< Latin cūlus buttocks) + -et -et

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World English Dictionary
culet (ˈkjuːlɪt)
 
n
1.  jewellery the flat face at the bottom of a gem
2.  either of the plates of armour worn at the small of the back
 
[C17: from obsolete French, diminutive of cul, from Latin cūlus bottom]

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Example sentences
Diamond culet size varies depending on the highest target pressure.
We believe there was a thin film of formic acid between the montmorillonite and the diamond culet due to the loading process.
The insulating gasket at the culet around the sample is semitransparent.
The toroid must be placed so as not to touch either diamond culet.
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