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Tetrasomy X, a rare chromosomal disorder affecting females, caused by the presence of four X chromosomes instead of two present in the usual human karyotype.

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(chiefly clothing) Initialism of extra extra extra extra extra large (the manufactured size or an item of that size).

(chiefly clothing) Initialism of extra extra extra extra extra large (of the manufactured size).

(chiefly clothing) Initialism of extra extra extra extra large (the manufactured size or an item of that size).

(chiefly clothing) Initialism of extra extra extra extra large (of the manufactured size).

(chiefly clothing) Initialism of extra extra extra extra extra extra large (the manufactured size or an item of that size).

(chiefly clothing) Initialism of extra extra extra extra extra extra large (of the manufactured size).