jettinessn.
/ˈdʒɛtɪnᵻs/, U.S. /ˈdʒɛdinᵻs/ rare.
Blackness.
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the world > matter > colour > named colours > black or blackness > [noun] > typical blackness > as jet
jeta1450
jettiness1776
1776 T. Pennant Brit. Zool. (ed. 4, octavo) I. ii. 327 On the return of spring [the head of the reed bunting] resumes its pristine jettyness.
1889 Reno (Nevada) Evening Gaz. 12 July The dog..is as black as a raven's wing, only two small white spots..breaking the jettiness of his coat.
1921 S. Comstock Daughter of Helen Kent xii. 225 Opening the wardrobe, she took down..the gleaming summer fur that shone like her own jettiness.
This entry has been updated (OED Third Edition, June 2011; most recently modified version published online March 2022).
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n.1776