S1U1B3S1T1R1A1T1A1
11 points
SUBSTRATA is validvalid
SUBSTRATUM, [n]
SUBSTRATUM, that which underlies something, as a layer of earth lying under another, also SUBSTRATE [n]
SUBSTRATUM, [n]
SUBSTRATUM, that which underlies something, as a layer of earth lying under another, also SUBSTRATE [n]