sard

Thân thiện

A jeweler examines a polished sard under a bright lamp.

Definition

Noun: A deep orange-red variety of chalcedony, a type of quartz. It is a semi-precious gemstone.

Usage

"Sard" is a specific geological and gemological term. It is used to name a particular mineral, typically in academic, scientific, or jewelry contexts. It functions as a countable noun (e.g., a sard, several sards).

Examples

• The ancient Roman signet ring was carved from a single piece of sard.
• Sard and carnelian are both varieties of chalcedony that share a similar composition.
• He examined the deep color of the sard under the jeweler's loupe.

Advanced Usage

• Sardonyx: This is a related, compound word. It refers to a gemstone variety that consists of layers of sard (or carnelian) and white onyx. It is often used for cameos.
  • The intricate cameo was carved from a piece of sardonyx.

Variants and Related Words

• Sardius (noun): An archaic or biblical term often used synonymously with sard, particularly referring to a precious stone.
• Carnelian (noun): A closely related variety of chalcedony that is typically a lighter, more reddish-orange or brownish-red color compared to the deeper orange-red of sard. The distinction between sard and carnelian is subtle and sometimes based on shade.

Synonyms

• Chalcedony (noun): The broader mineral group to which sard belongs. (Note: This is a category, not a direct synonym for the specific color variety.)
• Sardius (noun): As noted above, an archaic synonym.

Notes on Meaning

The primary and essentially only meaning of "sard" is the gemstone described. It does not have idiomatic expressions or phrasal verbs associated with it in modern English. Its usage is highly specialized.

Học thuật

Noun

1. a deep orange-red variety of chalcedony

Từ đồng nghĩa

• sardine
• sardius