Explore each form from the oldest known stage to today.
The character "痒" (yǎng/kayui) is a phono-semantic compound, formed during the era of small seal script in China. Its structure combines a semantic component (radical) and a phonetic component. The radical 疒, the "sickness" or "disease" radical, graphically depicts a sick person lying on a bed, clearly indicating that the character's meaning is related to a physical ailment or sensation. The phonetic component is 羊 (yáng), which means "sheep." In Old Chinese, the pronunciation of 羊 was a close approximation to the intended word for "itchy," and its primary function was to suggest the sound of the character, not its meaning. Historically, the character evolved from the small seal script into the clerical script (隷書) and finally standardized into the modern kaisho (楷書) form used today. Before the standardization of "痒," the concept of itchiness was sometimes represented by the character 癢, which shares the same meaning and a very similar composition, using 養 (yǎng, "to nourish") as its phonetic element. Over time, 痒 became the standard, simplified form in Japan. The kanji, along with the vast body of Chinese written culture, was introduced to Japan in waves, primarily from the 5th to the 8th centuries via Korean scholars and Japanese envoys to the Tang court. It was systematically adopted into the Japanese writing system. A notable linguistic point is the kanji's dual reading in Japanese. The on'yomi (Sino-Japanese reading) is "ヨウ" (yō), derived from the Chinese pronunciation of the time. The kun'yomi (native Japanese reading) is "かゆい" (kayui). Interestingly, the native Japanese word "kayui" may be etymologically related to "kayu" (mushy, soft), possibly evoking the sensation of something crawling on the skin. While the phonetic component 羊 ("sheep") is functionally unrelated to the meaning, a folk etymology sometimes whimsically connects the feeling of an itch to the sensation of a sheep's wool brushing against the skin.