half-adopted
 n.— «Donor-conceived siblings, who sometimes describe themselves as “lopsided” or “half-adopted,” can provide clues to make each other feel more whole, even if only in the form of physical details.» —“Hello, I’m Your Sister. Our Father Is Donor 150.” by Amy Harmon New York Times Nov. 20, 2005. (source: Double-Tongued Dictionary)

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