Greek also had an alpha copulativum, a- or ha-, expressing union or likeness, which is the a- expressing "together" in acolyte, acoustic, Adelphi, etc. It is from PIE root *sem- (1) "one; as one, together with."
It is the hypothetical source of/evidence for its existence is provided by: Sanskrit bhajati "assigns, allots, apportions, enjoys, loves," bhagah "allotter, distributor, master, lord," bhaksati "eats, drinks, enjoys;" Persian bakhshidan "to give;" Greek phagein "to eat," literally "to have a share of food;" Old Church Slavonic bogatu "rich."
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<a href="https://www.etymonline.com/word/aphagia">Etymology of aphagia by etymonline</a>
Harper, D. (n.d.). Etymology of aphagia. Online Etymology Dictionary. Retrieved $(datetime), from https://www.etymonline.com/word/aphagia