Definition of naissant in English:

naissant

Pronunciation /ˈnāsənt/ /ˈneɪsənt/

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

Origin

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