How to Write 嘧 (mì) — Meaning “mi (used in pyrimidine)”

Think of a mouth (口) whispering the sound "mi" (like 密) while holding a tiny DNA molecule — because 嘧 appears in pyrimidine bases of DNA. Another trick: imagine the right side 密 as a dense forest, and the mouth saying "mi" to remind you of the chemical name.

Write the left 口 first with three strokes: vertical, top horizontal, bottom horizontal. Then write the right side 密: start with the top dot, then the roof (宀), then the middle 必 (a heart-like shape), and finally the mountain (山) at the bottom. A common mistake is to forget the 山 part, making the character incomplete.

嘧 (mì) has 密 on the right, while 啻 (chì) has 帝 (emperor) on the right — 啻 means "only" or "but" in literary Chinese. The character 㕡 is extremely rare and not used in modern Chinese, so you will almost never see it. Visually, 嘧 is taller with a 山 component, unlike 啻 which ends with a cloth-like 巾.

嘧 is only used in scientific vocabulary, primarily in biochemistry and genetics — for example, 嘧啶 (pyrimidine), 胞嘧啶 (cytosine), and 尿嘧啶 (uracil). These are DNA and RNA components. You will never see 嘧 in daily conversation, news, or literature; it is strictly a technical character.

Common words containing 嘧 include: 嘧啶 (mì dìng) — pyrimidine; 胞嘧啶 (bāo mì dìng) — Cytosine; 尿嘧啶 (niào mì dìng) — uracil.