Meaning of oxygen cycle

ox'ygen cy"cle

Pronunciation: [key]
— Ecol. Ecol.
  1. the process by which oxygen released into the atmosphere by photosynthetic organisms is taken up by aerobic organisms while the carbon dioxide released as a by-product of repiration is taken up for photosynthesis.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.