. "0"^^ . . . "108128216"@en-us . . . "08657249-n"^^ . . "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)"@en-us . "108657249"^^ . "stratum"^^ . "0"^^ . . . . . "stratum"@en-us . . . . . . . . . .