Trisomy

//ˈtɹʌɪ.sə(ʊ)mi// noun

Definitions

Noun
  1. 1
    The presence of three copies, instead of the normal two, of a particular chromosome of an organism. countable, uncountable
  2. 2
    chrosomal abnormality in which there is one more than the normal number of chromosomes in a cell wordnet

Etymology

From trisome + -y.

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