As a deity name
Name 700 of the Ganesha Sahasranāma — Ganesha Purana (Upasana Khanda), as taught by Sage Vyasa / Lord Ganesha
As a Hindi name
अहर्निश · adv
रातदिन · सदा । नित्य — Śabdasāgara
अहर्निश · ahar-niś · s.m.
and adv. Day and night, the whole day — Platts (1884), digital edition courtesy DSAL, University of Chicago, p. 110
As a Sanskrit word
Meaning
day and night, a whole day
Scripturally attested Verified derivationMultiple readings (2)Why this matches what you typed
The spelling you confirmed, अहर्निश, is itself a dictionary headword — no grammatical transformation stands between what you typed and the meaning above.
Dictionary citations
ahar—niśa n. day and night, a whole day, Mn. i, 74; iv, 97
Alternative readings
More than one analysis survives full verification. That ambiguity is real, so we show every reading rather than pick one silently.
Caveats
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