Relating to or made up of gestures; emphasizing physical movement or bodily expression.
From Latin 'gestus' combined with the suffix '-ical' (an extended form of '-ic' meaning 'relating to'). This creates a more formal adjective emphasizing gesture-based communication.
'Gestical' is a fancier version of 'gestic'—both describe communication that's all about the body and movement, which is why dancers and mimes are masters of gestical expression!
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