oxy-, -oxia, -oxic
(Greek: sharp, acute, pointed, keen; sour, acid, acidic, pungent)
2. Concerning a great lack of oxygen: When there is a high concentration of salt in certain bodies of water an anoxic condition can exist in the water.
2. One of many widely used synthetic or natural substances added to a product to prevent or delay its deterioration by the action of oxygen: Rubber, paints, vegetable oils, and prepared foods commonly contain antioxidants. Assisting the cell’s enzyme protectors are the antioxidants vitamins E and C and beta-carotene, a precursor of vitamin A.
These vitamins absorb or attach to the free radicals, preventing them from attacking normal tissues. Current antioxidant therapy consists mainly of oral vitamins and food additives.
A near-death experience (NDE) consists of experiences of people after they have been pronounced clinically dead, or who have been very close to death.
Typical features of the near-death experiences are an OBE (Out of Body Experience), a fully conscious experience in which the person's center of awareness appears to be outside the physical body, a life review, a tunnel experience, a light, coming to a boundary (marking death), seeing dead friends, and relatives, experiencing a loving or divine presence, and making a choice (or being told) to return.
Occasionally near-death experiences can be frightening and distressing, and often have profound effects on the person's later life.
2. In ecology, a condition in which inadequate environmental oxygen is available to an organism.
The "Dead Zone" off the Louisiana coast mapped during the last week of July, 2006, is reported to be 6,662 square miles; or about the size of Connecticut and Rhode Island combined, Dr. Nancy Rabalais, Chief Scientist for Northern Gulf of Mexico Hypoxia Studies reported on Friday. The low oxygen waters extended from near the Mississippi River to the Louisiana-Texas border.
Agricultural runoff in the vast area drained by the Mississippi River contributes most of the nitrogen, phosphorus and other nutrients that feed a population boom of algae. As the algae die, they fall to the bottom. Their decay consumes oxygen faster than currents can bring it down from the surface.
2. The loss of electrons in an atom with an accompanying increase in positive valence: Oxidation is a reaction when an element's atoms release electrons which then increase the state of oxidation of the element.
An oxide is a chemical compound in which oxygen is the negative radical.
2. To undergo or cause to undergo oxidation; lose or remove electrons: Silver doesn't rust or oxidize when exposed to air, and is therefore not especially reactive.
2. In space technology, a substance, usually containing oxygen, that supports the combustion reaction of rocket fuel: Both the fuel and oxidizer constitute a propellant.