Meaning of DIAMOND in English

DIAMOND

/ ˈdaɪəmənd; NAmE / noun

1.

[ U , C ] a clear precious stone of pure carbon , the hardest substance known. Diamonds are used in jewellery and also in industry, especially for cutting glass :

a ring with a diamond in it

a diamond ring / necklace

She was wearing her diamonds (= jewellery with diamonds in it) .

The lights shone like diamonds.

—see also rough diamond

2.

[ C ] a shape with four straight sides of equal length and with angles that are not right angles

3.

diamonds [ pl. , U ] one of the four suits (= sets) in a pack / deck of cards. The cards are marked with red diamond shapes :

the ten of diamonds

4.

[ C ] a card of this suit :

You must play a diamond if you have one.

5.

[ C ] ( in baseball ) the space inside the lines that connect the four bases ; also used to mean the whole baseball field

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WORD ORIGIN

Middle English : from Old French diamant , from medieval Latin diamas , diamant- , variant of Latin adamans from Greek adamas , adamant- , untameable, invincible (later used to denote the hardest metal or stone, hence diamond), from a- not + daman to tame.

Oxford Advanced Learner's English Dictionary.      Оксфордский английский словарь для изучающик язык на продвинутом уровне.