carat

英 ['k?r?t] 美['k?r?t]

TEM8GRETOEFL低頻詞擴展詞匯

復數:?carats;

1. 音譯“克拉”。

carat 克拉，開

來自PIE*ker, 角，詞源同horn，carob。源自歷史上用角豆樹（carob）種子測量黃金或寶石含量，后用作黃金純度單位。

carat: carat: [16] The carat gets its name from the use of carob beans as standard weights for measuring the heaviness of small quantities. The Greek name for the elongated seed pod of the carob tree was kerátion, a derivative of kéras ‘horn’ (related to English horn). This passed into Arabic as qīrāt, where it became formalized in a system of weights and measures as ‘four grains’. It passed into English via Italian carato and French carat.
=> horn
carat (n.): also karat, mid-15c., from Middle French carat "measure of the fineness of gold" (14c.), from Italian carato or Medieval Latin carratus, both from Arabic qirat "fruit of the carob tree," also "weight of 4 grains," from Greek keration "carob seed," also the name of a small weight of measure (one-third obol), literally "little horn" diminutive of keras "horn" (see kerato-).

Carob beans were a standard for weighing small quantities. As a measure of diamond weight, from 1570s in English. The Greek measure was the equivalent of the Roman siliqua, which was one-twentyfourth of a golden solidus of Constantine; hence karat took on a sense of "a proportion of one twentyfourth" and became a measure of gold purity (1550s). Eighteen carat gold is eighteen parts gold, six parts alloy. It is unlikely that the classical carat ever was a measure of weight for gold.

3. Can you believe that he bought her a 5.3 - carat diamond ring?: 你知道嗎,他買了一顆5.3克拉的鉆石戒指給她?

4. One sign of Mastitis mastitis is carat cracked skin on the tisteats.: 乳腺癌的一個現象是乳頭皮膚裂開,同時乳腺發熱,疼痛變大.

5. This diamond, may process is 150 carat fine diamonds.: 這顆鉆石, 可以被加工成一顆重達150克拉的精美鉆石.