adjective Genetics.
having one chromosome in addition to the usual diploid number.

trisome + -ic Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
trisomy (ˈtraɪsəʊmɪ)
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
[C20: from tri- + (chromo)som(e) + -y³]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The progenies of these plants were studied and they produced diploid and simple trisomic plants.
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