noun, Geology. 1. a linear zone in the sea floor along which magma rises and from which adjacent crustal plates are moving apart.
- Spreading zone
spreading zone (sprěd’ĭng) See divergent plate boundary.
- Spread it thick
- Spread like wildfire
Disseminate or circulate very quickly, as in The rumor about their divorce spread like wildfire. The noun wildfire means “a raging, rapidly spreading conflagration.” [ c. 1800 ]