pupils is a form of:

Silver



noun
1.
(UNCOUNTABLE) (Symbol Ag) (a shiny white precious metal, coins made of this or of an alloy resembling, silver dishes or ornaments, silverware, the lustrous, grayish white color of silver, something having this color as the containing silver, marking the 25th anniversary. -silver halides chemical solution for use in photography. -silver jubilee a 25th anniversary of an event) លោហៈ (ធាតុប្រាក់)
Example: Pure silver, A silver box, A silver mine, a silver cup, silversmith, silver, silver wedding.made of silver ប្រាក់ the color silver ពណ៌ប្រាក់
adjective
1.
(1. Made of or containing silver: a silver bowl; silver ore. 2. Resembling silver, especially in having a lustrous shine; silvery. 3. Color. Of a lustrous medium gray: silver hair. 4. Having a soft, clear, resonant sound) នៃប្រាក់, ដែលធ្វើពីប្រាក់ silver color ដែលមានពណ៌ប្រាក់
ENGLISH MEANING
noun
1.
A soft white metallic element, sonorous, ductile, very malleable, and capable of a high degree of polish. It is found native, and also combined with sulphur, arsenic, antimony, chlorine, etc., in the minerals argentite, proustite, pyrargyrite, ceragyrite, etc. Silver is one of the "noble" metals, so-called, not being easily oxidized, and is used for coin, jewelry, plate, and a great variety of articles. Symbol Ag (Argentum). Atomic weight 107.7. Specific gravity 10.5.
2.
Coin made of silver; silver money.
3.
Anything having the luster or appearance of silver.
4.
The color of silver.
adjective
1.
Resembling silver.
2.
Bright; resplendent; white.
3.
Giving a clear, ringing sound soft and clear.
4.
Sweet; gentle; peaceful.
5.
Of or pertaining to silver; made of silver; as, silver leaf; a silver cup.
verb
1.
(TRANSITIVE) To cover with silver; to give a silvery appearance to by applying a metal of a silvery color; as, to silver a pin; to silver a glass mirror plate with an amalgam of tin and mercury.
2.
(TRANSITIVE) To polish like silver; to impart a brightness to, like that of silver.
3.
(TRANSITIVE) To make hoary, or white, like silver.
4.
(INTRANSITIVE) To acquire a silvery color.
1.
Precious, costly