or stratified-charge engine
an internal-combustion engine in which a small charge of a rich fuel mixture is ignited first and used to improve combustion of a larger charge of a lean fuel mixture.
- Stratified epithelium
stratified epithelium n. Epithelium made up of a series of layers, the cells of each varying in size and shape. Also called laminated epithelium.
noun, Statistics. 1. a random sample of a population in which the population is first divided into distinct subpopulations, or strata, and random samples are then taken separately from each stratum.
- Stratified sample
noun 1. (statistics) a sample that is not drawn at random from the whole population, but separately from a number of disjoint strata of the population in order to ensure a more representative sample See also frame (sense 13)
adjective 1. Geology. occurring as a bed or beds; arranged in strata. 2. Anatomy. noting arrangement in thin layers, as in bone. 3. Meteorology. (of a cloud) having predominantly horizontal development. adjective 1. (of rocks) occurring as or arranged in strata 2. (meteorol) resembling a stratus cloud