缇 Origin — Chinese Character Wiki

tí

reddish color

Phonosemantic compound. 纟 represents the meaning and 是 represents the sound. Simplified form of 緹.

Components

纟 Meaning component

sī silk

纟 is a component form of 糸.

是 Sound component

shì, shi is

Phonosemantic compound. 糹 represents the meaning and 是 represents the sound.

糹 Meaning component

mì silk

是 Sound component

shì, shi is

Change in sound

緹 and 是 don't sound similar in modern Mandarin due to historical phonetic changes. They were more similar in Old Chinese.
緹 deː
是 *[d]eʔ

Regular Modern

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	Old Chinese
Zhengzhang	tʰeːʔ
	deː

《說文》：“緹，帛丹黃色。从糸，是聲。衹，緹或从氏。”