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Meaning of mid-ocean ridge

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.