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limequat

n. 1 A citrus tree, a cross between a lime and a kumquat, (taxlink Citrus × floridana nothospecies noshow=1) 2 The fruit from this tree

Wikipedia
Limequat

The limequat is a citrofortunella hybrid that is the result of a cross between the key lime and the kumquat, hybridized by Walter Tennyson Swingle in 1909.