• 紫色むらさきいろ — purple color
• 紫外線しがいせん — ultraviolet rays
• 紫陽花あじさい — hydrangea
• 深紫しんし — deep purple
• 浅紫せんし — light purple

紫 is composed of 糸 (thread) and 此 (phonetic component シ). The character originally symbolized a purple dye extracted from certain plants, often used for clothing in ancient times.