firstling

[ furst-ling ]
/ ˈfɜrst lɪŋ /
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noun

the first of its kind to be produced or to appear.
first offspring.
a first product or result.

Origin of firstling

First recorded in 1525–35; first + -ling1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for firstling

firstling

/ (ˈfɜːstlɪŋ) /

noun

the first, esp the first offspring
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012