a faint rainbow formed by light rays that undergo two internal reflections in drops of rain, appearing above the primary rainbow and having its colors in the opposite order.
noun 1. extraction of oil or natural gas under artificially induced pressure after the natural flow has ceased.
noun 1. a road less important than a main road or highway.
- Secondary saturation
secondary saturation n. A technique of nitrous oxide anesthesia consisting of an abrupt curtailment of the oxygen in the inhaled mixture to produce deep anesthesia, with oxygen afterwards administered to correct overdosage and relax the muscles.
noun 1. a high school or a school of corresponding grade, ranking between a primary school and a college or university. secondary school noun 1. a school for young people, usually between the ages of 11 and 18