one of several parallel layers of material arranged one on top of another (such as a layer of tissue or cells in an organism or a layer of sedimentary rock)
discovered or determined by scientific observation; "variation in the ascertained flux depends on a number of factors"; "the discovered behavior norms"; "discovered differences in achievement"; "no explanation for the observed phenomena"
tending or intended to correct or counteract or restore to a normal condition; "corrective measures"; "corrective lenses"
designed to promote discipline; "the teacher's action was corrective rather than instructional"; "disciplinal measures"; "the mother was stern and disciplinary"