differences - Demi-,semi-,hemi- Usage with words


Friends. I am confused. If semi, demi and hemi all have the meaning of "half" then how to know which should be used with this or that word? There is hemisphere and semicircle and demicycle. Will it be a mistake to say semicycle, hemicircle or demisphere? Are they interchangable? I guess there should be a strict difference between the three. And can they be used with adverbs and verbs?




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