Siblinged

adj

Definitions

Adjective
  1. 1
    Having a sibling or siblings. not-comparable, rare

    "Only children also have a slight advantage in terms of vocabulary and math readiness over their siblinged counterparts, though “by the time they’re 25 or so, it’s pretty much dissipated,” according to Toni L. Falbo, a psychology professor at the University of Texas at Austin who has studied only children for decades."

Etymology

From sibling + -ed.

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