substratorius

substratorius [CL substernere+-torius, cf. LL substratorium], that is spread out beneath, (tapetum ~ium) rug, carpet. c1170 sibi a me tapetum pedum humile ~ium mitti mandaverit G. Foliot Ep. 247; ornatus chori consistit in dorsalibus et tapetis ~iis Beleth RDO 85. 89D.