sickle-cell trait
noun
sick·le-cell trait
ˈsi-kəl-ˈsel-
: an inherited usually asymptomatic blood condition in which some red blood cells tend to sickle but usually not enough to produce anemia and that occurs primarily in individuals of African, Mediterranean, or southwest Asian ancestry who are heterozygous for the gene controlling hemoglobin S
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Merriam-Webster unabridged
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