motorium

noun
mo·to·ri·um | \ mō-ˈtōr-ē-əm \
plural -ria\-ē-ə \

Medical Definition of motorium 

1 : the part of an organism and especially the part of its nervous system that is concerned with movement as distinguished from that concerned with sensation

2 : a differentiated cytoplasmic area in certain protozoans that acts as a coordinating center analogous to the brain of higher animals

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occurring twice a year or every two years

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