Definition of diamantine in US English:



  • Made from or reminiscent of diamonds.

    • ‘It has been known from recent publications to use methane gas for depositing diamantine carbons whereby a desired material has been obtained under high vacuum and temperatures in the range of over 1,000 degrees C.’
    • ‘Roni Mahler, guesting as the Countess, is diamantine as A Dragon Lady, all knowing, all seeing, reeking with impatience over insubordination.’
    • ‘Theodore Rousseau's burning winter sunrise over the Qise, its darkness torch-streaked with carmine and gold, sets off a chain-shot of diamantine flames in the hoarfrost on the stony riverbank.’
    • ‘Through her suit, Suzie Nova felt the diamantine exterior of the alien contraption throb faintly below her feet, alive with incomprehensible energies that course through it like blood through arteries.’


Mid 16th century (in the sense ‘hard as diamond’): from French diamantin, from diamant ‘diamond’.