A chromosomal abnormality consisting of the absence of one chromosome from the normal diploid number.
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49,XXXYY syndrome
MONDO:0016854
monosomy 22
MONDO:0019891
monosomy X
MONDO:0020466
chromosome 18 mosaic monosomy
MONDO:0022755
tetrasomy
MONDO:0030502
monosomy chromosome 8
MONDO:0700035