subzero
n.— «Next fall, fashion designer Nicole Miller plans to introduce a size smaller than zero. Many people are calling it a “subzero” and referring to it as a negative size. Banana Republic currently offers size 00, which is smaller than a zero.» —“False sizing benefits debated” by Anna Faltermeier in University of Kansas University Daily Kansas (Lawrence, Kansas) Nov. 1, 2006. (source: Double-Tongued Dictionary)
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