masculine nominative singular + ca (conjunction)
Analysis. āyasmantaṃ + ca: 'venerable one' (nominative form used as honorific address) + 'and' (here functioning as a particle of politeness appended to the address, roughly 'honourable sir, and [I address you thus]')
Etymology. ā- (toward, up to) + ayus (life, lifespan) + -mant (having quality). Ayus is cognate with Latin aevum 'age, lifetime' and Greek aiōn 'age, aeon' (all from PIE *h₂ey- 'to live, last'). The prefix ā- reverses the spatial sense here: 'having-life-reaching-toward-you' becomes an honorific 'venerable'. Mant is the suffix denoting possession of a quality (like Sanskrit -mant, -mat).
Meanings from the Digital Pāḷi Dictionary; morphology and etymology by Claude.
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