فست ند فستط

فُسْتَاطٌ ذ , also written فِسْتَاطٌ: see فُسْطَاطٌ, in art. فسط, to which it belongs; for the ت is a substitute for the [former] ط in فسطاط, or for the [latter] س in فِسَّاطٌ. (M and TA in art. فسط.)