Ap (water)
Ap (áp-) is the Vedic Sanskrit term for "water", which in Classical Sanskrit only occurs in the plural āpas (sometimes re-analysed as a thematic singular, āpa-), whence Hindi āp. The term is from PIE hxap "water". The Indo-Iranian word also survives as the Persian word for water, āb,  e.g. in Punjab (from panj-āb "five waters"). In archaic ablauting contractions, the laryngeal of the PIE root remains visible in Vedic Sanskrit, e.g.