As a Hindi name
यामुन · adj
[वि॰ स्त्री॰ यामुनी] यमुना नदी संबंधी । जैसे, यामुन जल — Śabdasāgara
यामुन · noun · masculine
यमुना के किगारे बसनेवाले मनुष्य · एक पर्वत का नाम · महाभारत के अनुसार एक तीर्थ का नाम — Śabdasāgara
यामुन · yāmun · s.m.
Antimony; sulphuret of antimony, collyrium — Platts (1884), digital edition courtesy DSAL, University of Chicago, p. 1248
As a Sanskrit word
Meaning
belonging or relating to the river Yamunā (commonly called Jumna), coming from it, growing in it &c.
Verified derivationWhy this matches what you typed
The spelling you confirmed, यामुन, is itself a dictionary headword — no grammatical transformation stands between what you typed and the meaning above.
Gender counterpart
The kosha attests this stem in the feminine, the masculine, and the neuter — the same name serves without alteration.
Dictionary citations
yāmuna mfn. (fr. yamunā) belonging or relating to the river Yamunā (commonly called Jumna), coming from it, growing in it &c., MBh.; Hariv.; R.
yāmuna m. a metron. Pāṇ. iv, 1, 113, Sch.
N. of a mountain, MBh.; R.
of an author (also called yāmunācārya and ˚rya-svāmin), Cat.
pl. N. of a people, MBh.; Var.; Pur.
Caveats
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