mid-ocean ridge: Meaning and Definition of

mid'-o•cean ridge'

Pronunciation: (mid'ō"shun), [key]
  1. any of several seismically active submarine mountain ranges that extend through the Atlantic, Indian, and South Pacific oceans: each is hypothesized to be the locus of seafloor spreading.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.