noun pl. strata stra′ta (-ə) or stratums-·tums. a horizontal layer or section of material, esp. any of several lying one upon another; specif., Biol. a layer of tissue
stra·tum (str t m, str t m) n. pl. stra·ta (-t) or stra·tums. 1. A horizontal layer of material, especially one of several parallel layers arranged one on top of another.
Hotmail
