Definition of naissant in US English:

naissant

adjective

Heraldry
  • (of a charge, especially an animal) issuing from the middle of an ordinary, especially a fess.

    • ‘A demi-lion naissant from the partition or with a sword argent in the paw dexter.’
    • ‘Or, a demi-lion rampant gules, naissant from a fesse sable.’
    just beginning, budding, developing, growing, embryonic, incipient, young, in its infancy, fledgling, evolving, emergent, emerging, rising, dawning, advancing, burgeoning
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Origin

Late 16th century: from French, literally ‘being born’, present participle of naître, from Latin nasci ‘be born’.

Pronunciation

naissant

/ˈnāsənt/