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/ˈtɹʌɪ.sə(ʊ)mi/ · noun
(cytology) The presence of three copies, instead of the normal two, of a particular chromosome of an organism..
Use trisomy 21 when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Trisomy 21 means (cytology) The presence of three copies, instead of the normal two, of a particular chromosome of an organism..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use trisomy 21 where its definition matches the intended context.
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