white rice
絖 centers on white rice, specifically the polished, shiny grains. The meaning is narrow and concrete, without broad abstract extensions.
絖 combines 糸 (thread/silk) with 光 (light), likely suggesting the shiny, polished appearance of white rice. The exact historical development is uncertain.
Silk thread 糸 shining with light 光: imagine polished white rice grains gleaming like silk threads under a bright light.
For コウ, picture a bowl of white rice glowing with a warm, golden light: glow -> コウ, and the rice shines.
heddle; heald; part of a loom, a wire or cord with an eye, through which the warp threads are threaded