Plural of ataxia; multiple types or instances of lack of muscular coordination and loss of balance.
Greek ataxia (disorder, lack of order), plural form. The root comes from a- (not) and taxis (order, arrangement), literally meaning 'without order.'
The word ataxia beautifully captures the problem: your brain literally can't 'put things in order' anymore—it's not that your muscles are weak, but that the instructions they're receiving are scrambled.
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