But his wife
'ishshah (ish-shaw')
irregular plural, nashiym {naw-sheem'}; a woman
looked back
nabat (naw-bat')
to scan, i.e. look intently at; by implication, to regard with pleasure, favor or care -- (cause to) behold, consider, look (down), regard, have respect, see.
from behind him
'achar (akh-ar')
the hind part; generally used as an adverb or conjunction, after (in various senses)
and she became a pillar
ntsiyb (nets-eeb')
something stationary, i.e. a prefect, a military post, a statue -- garrison, officer, pillar.
of salt
melach (meh'-lakh)
powder, i.e. (specifically) salt (as easily pulverized and dissolved -- salt(-pit).