As a Hindi name
नहीं
no, not (negative response to a yes-no question); no, not (used for negation of statements in the indicative and contrafactual moods)
Śabdasāgara also records: कुहरा · पाला । हिम । तुषारक । बर्फ
Platts (p. 1171) also records: Fog, mist
a Hindi word, a tadbhava: evolved from the Sanskrit through Prakrit नहि — per Wiktionary’s etymology record
“Inherited from Prakrit 𑀡𑀳𑀺 (ṇahi) (with spontaneous nasalization), from Sanskrit नहि (nahí, “surely not”), from Proto-Indo-Iranian *naǰʰí, from earlier *ná gʲʰí, from Proto-Indo-European *né + *gʰí. Cognate with Assamese নাই (nai), Bengali নাই (nai), Braj नहीं (nahī̃), Marathi ना…” — per Wiktionary’s etymology record
na—hi See na-hi.
na-hi (na-hi, MaitrS. & ŚBr.) ind. (g. cādi) for not, surely not, by no means, not at all (often strengthened by other particles, as aṅga, nu, sma), RV.; &c. (nahikam, g. cādi).
As a Sanskrit word
Meaning
mist, fog, hoar-frost, heavy dew, &c. &c. (cf. ni-hāra under ni-hṛ)
Verified derivationMultiple readings (2)Why this matches what you typed
The spelling you confirmed, नीहार, is itself a dictionary headword — no grammatical transformation stands between what you typed and the meaning above.
Dictionary citations
nī—hāra m. (once n.) mist, fog, hoar-frost, heavy dew, RV. &c. &c. (cf. ni-hāra under ni-hṛ)
evacuation (cf. nir-h˚)
nīhāra m. (-raḥ) 1 Frost, hoar frost. 2 Heavy dew. E. ni before hṛ to steal or take, aff. ghañ.
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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