1. SYN: accessory chromosome. 2. Obsolete term for ribosome. 3. A structure consisting of a single ribosome bound to a molecule of mRNA. [mono- + chromosome]
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mono·some 'män-ə-.sōm n
1) a chromosome lacking a synaptic mate esp an unpaired X chromosome
2) a single ribosome
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mono·some (monґo-sōm) [mono- + -some] 1. the chromosome lacking a homologue in monosomy. 2. a single ribosome complexed with a strand of messenger RNA (mRNA). Cf. polysome. 3. a single ribosome that has dissociated from a polysome.Medical dictionary. 2011.