trisomy

tri·so·my  (tr-sm, trs-)

n. pl. tri·so·mies

The condition of having three copies of a given chromosome in each somatic cell rather than the normal number of two.

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[tri- + -som(e) + -y.]

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trisome n.

tri·somic adj.

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trisomy [ˈtraɪsəʊmɪ]

n

(Medicine) the condition of having one chromosome of the set represented three times in an otherwise diploid organism, cell, etc. Trisomy of chromosome 21 results in Down's syndrome

[from tri- + (chromo)som(e) + -y³]

trisomic  [traɪˈsəʊmɪk] adj

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trisomy  (tr-sm, trs-)

The condition of having three copies of a given chromosome in each body cell rather than the normal number of two.

Thesaurus

Noun

1.

trisomy - chrosomal abnormality in which there is one more than the normal number of chromosomes in a cell Down syndrome, Down's syndrome, mongolianism, mongolism, trisomy 21 - a congenital disorder caused by having an extra 21st chromosome; results in a flat face and short stature and mental retardation chromosomal aberration, chromosomal anomaly, chromosonal disorder, chrosomal abnormality - any change in the normal structure or number of chromosomes; often results in physical or mental abnormalities