Definitions

kōu hollow; scallion stalk

Etymology phono-semantic

grass

Semantic: Phonetic:

About

In traditional Chinese medicine, the character (kōu) is a phono-semantic compound: the grass radical (cǎo) on top signals a plant-related meaning, and the phonetic (kǒng) below indicates the pronunciation. Its original sense is the hollow stalk of a scallion or green onion, a cylindrical stem with an empty center. This botanical image was borrowed by ancient physicians to name the "scallion-stalk pulse" (芤脉), a pulse that feels large and soft but hollow at its core.