Definition of mountain gem in English:

mountain gem

Syllabification: moun·tain gem

noun

A green hummingbird found in the upland forests of Central America.
  • Genus Lampornis, family Trochilidae: several species

Definition of mountain gem in:

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Word of the day epyllion
Pronunciation: ɪˈpɪlɪən
noun
a narrative poem resembling an epic in style...