masc nom sg of tuccha (adj)
Etymology. From the root √tuc- meaning 'to beat' or 'to hollow out'; related to the concept of making something empty by striking or hollowing. The semantic shift from 'beaten, hollowed' to 'empty, void' parallels English 'beat' (to strike metal thin) and Latin 'tutus' (safe, hence hollowed, vacant). The sense of hollowness develops from the physical action of removing contents by percussion.
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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