masc nom sg of bhavant (noun); masc voc sg of bhavant (noun)
Etymology. From bhavant, the present participle of bhavati (to be, become), literally 'being present' or 'one who is'. The vocative form bho, used as a respectful interjection, retains the sense of addressing someone as 'one present' or 'existing'. Cognate with Sanskrit bhavant-, English "be", Latin fuisse, Greek phyein (to grow, come into being), all from the Indo-European root *bheuh₂- (to become, grow).
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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