How to Write 蠕 (rú) — Meaning “To wriggle / To crawl”

Imagine a worm (虫) that 'needs' (需) to wriggle to move forward. This image connects the two parts: the insect radical and the need component. So you can remember 'worm needs to wriggle'.

The left radical 虫 is small and occupies about one-third of the character's width. The right side 需 has many strokes; be careful to write the top part 雨 with a short first horizontal and the bottom part 而 with balanced strokes. The most common mistake is making the right side too narrow or forgetting the dot in 雨.

蟛 (péng) has the radical 虫 with 彭 on the right, meaning a type of crab, while 蟟 (liáo) has 尞 on the right, meaning a kind of insect. In contrast, 蠕 focuses on the action of wriggling or crawling, not a specific creature. Visually, the right side components are completely different: 需 vs 彭 vs 尞.

蠕 is used in scientific and medical terms like 蠕动 (rú dòng, peristalsis) to describe wave-like muscle movements in the digestive system. It also appears in 蠕虫 (rú chóng, worm) for parasitic worms. This character is not common in daily conversation but important in biology texts.

Common words containing 蠕 include: 蠕动 (rú dòng) — Wriggle / Peristalsis; 蠕虫 (rú chóng) — Worm / Helminth; 蠕行 (rú xíng) — To creep / To crawl slowly.