紫 zi3
adjective
Kun Reading
紫 | むらさき murasaki
noun
: purple; violet; amethyst
: (Usually written using kana alone) Lithospermum erythrorhizon (species of gromwell)
: type of soy sauce
On Reading
し shi
Usage:
紫外線 zi3wai4 xian4: UV ray [しがいせん shigaisen]
紫斑 zi3ban1: bruise [しはん shihan]
紫晶 zi3jing1: amethyst [紫水晶 | むらさきすいしょう murasakisuishou]
紫陽 花zi3yang2hua1 | あじさい ajisai: hydrangea [繡球花 xiu4qiu2hua1]
茜紫 qian4zi3: sage (herb)
Etymology:
形声 Pictophonetic
[此] (ci3: this/these) provides the sound
[糸] (si1: silk) provides the meaning
Examples:
紫外線可導緻皮腐癌。
(zi3wai4 xian4 ke3dao3 zhi4 pi2fu1ai2)
UV rays can cause skin cancer.
Resources: Chinese Dictionary | Japanese Dictionary