أس

Etymology
The Arabic root is weakly developed; thus is concluded that all other words in it are denominal from this noun and this noun is, similarly to other architectural terms, borrowed from, from , whereas in reference to remains of ashes and hence campsite, or in bedouin rather than urban signification, it can be comprehended as inherited from , quod vide.

Noun

 * 1) foundation, groundwork, basis
 * 2)  power, exponent
 * 3)  remain, relic, trace, vestige, mark left