substrate
sub.strate \'s*b-.stra-t\ n [ML substratum] 1: SUBSTRATUM 2: the base on which an organism lives {the soil is the ~ of most s eed plants} 3: a substance acted upon (as by an enzyme)
sub.strate \'s*b-.stra-t\ n [ML substratum] 1: SUBSTRATUM 2: the base on which an organism lives {the soil is the ~ of most s eed plants} 3: a substance acted upon (as by an enzyme)