The state of an individual or cell with an extra chromosome instead of the normal pair of homologous chromosomes; in humans, the state of a cell containing 47 normal chromosomes.For various types of t. syndrome, see under syndrome. [tri- + (chromo)some]
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tri·so·my 'trī-.sō-mē n, pl -mies the condition (as in Down syndrome) of having one or a few chromosomes triploid in an otherwise diploid set
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n.
a condition in which there is one extra chromosome present in each cell in addition to the normal (diploid) chromosome set. A number of chromosome disorders are due to trisomy, including Down's syndrome and Klinefelter's syndrome.
• trisomic adj.
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tri·so·my (triґso-me) [tri + Gr. sōma body] the presence of an extra chromosome of one type in an otherwise diploid cell (2n +1). See specific trisomy syndromes under syndrome. trisomic adjMedical dictionary. 2011.