| Language | Lexeme | Native script | Phonetic | Phonemic | Notes | |
|---|---|---|---|---|---|---|
| 32 | Kashmiri | aab | آب | ɑːb | ɑːb | |
| 67 | Persian: Tehran | āb | آب | ɒːb | ɒb | |
| 54 | Kurdish N.: Bahdini | av | ɑːv | ɑv | ||
| 44 | Avestan: Younger | ap | 𐬀𐬞 | ap | Stem āp-/ap-, mostly plural, Nom.sg. āfš | |
| 65 | Old Persian | ap | 𐎠𐎱 | ap | ||
| 20 | Pali | āpa | aːpɐ | aːpa | ||
| 47 | Khotanese | ūtca | uːtsɐ | uːt͜sa | ||
| 49 | Wakhi | yupk | jupk | |||
| 66 | Middle Persian | āb | ʾb | ɑːβ | aːb | ZP ʾp̄ |
| 53 | Parthian | āb | ʾʾb | ɑːb | aːb | AF ʾb |
| 19 | Vedic: Early | ā́p* | आप्* | ˈaːp | áːp | pl. ā́pas; VEDIC SWADESH TERM! (= clearly more frequent than) ~vā́r ~ váar n. |
| 71 | Kumzari | 'āw | ʔaːw | ʔaːw | ||
| 51 | Yaghnobi | ōp | AF ōw | |||
| 68 | Bakhtiari | aw | ʔəw | aʋ | ||
| 52 | Bactrian | abbo | αββο | aːβ | cf. Manichaean ˀβ | |
| 46 | Sogdian | āp | ʾp | aːp | ||
| 61 | Mazanderani | u | u | |||
| 69 | Delvari | ow | ow | |||
| 70 | Lari | ow | ow | |||
| 62 | Balochi: Sistani | āp | ɑp | |||
| 55 | Kurdish C.: Jafi | āw | ɑw | |||
| 60 | Tati | viye | vije | |||
| 35 | Gawarbati | aau | آوُ | aːˈʊ | aːwu | GM ā̌ū |
| 34 | Gawri | ū | اُو | ʔṵːʔ | uː H(L) | |
| 48 | Pashto | oba | اوبه | ˈʔo.bə | ʔobə | |
| 59 | Raji: Barzoki | u | ʔu | u | ||
| 56 | Kurdish S.: Elami | āw | ɒw | |||
| 58 | Hawrami | āwī | ɑwi | |||
| 36 | Khowar | uɣ | اوغ | uˑχ | uɣ | |
| 43 | Vâsi-vari: Paṣki | ′âv | ˈāw | ˈaːβ | ˈaβ | |
| 38 | Kamviri | ′oa | ˈo̞ː | ˈo̞ɨ | ||
| 39 | Kâta-vari: Eastern | ′ov | ′ōw | ˈo̞ʋ | ˈo̞v | |
| 40 | Kâta-vari: Ktivi | âv′a | aβ̞ˈɨ | aβ̞ˈɨ | ||
| 41 | Kalaṣa-alâ: Nišeigrâm | âv | ˈa̞β̞ | a̞β | ||
| 42 | Saṇu-viri: Wâmâ | âb′o | abˈʊ | abˈʊ | ||
| 57 | Kurdish S.: Qorveh | āw | ɑw |
S.v. Ved. áp- 'Wasser', from PIE *h₂ep- (cf. Hitt. directive ḫa-pa-a 'zum Fluß', TochAB āp 'Wasser, Fluß, Strom', OPr. ape 'Bach, kleiner Fluß', Lith. ùpė 'Strom, Fluß', Latv. upe 'Fluß, Bach').
For MIA, NIA and Nuristani forms, cf. s.v. 407 áp f., pl. ā́paḥ 'waters' RV.
S.v. *h₂ep- 'Wasser, Fluß' (IEW 1,51f., 1149, EIEC 486, 636).