Α- : in
composition—(1) ‘privative,’ see ἀν-.—(2)
‘copulative,’ originally σα, contains an idea of union, as in ἅπα_ς (πᾶς), ἀολλης (ϝείλλω).—(3) ‘prothetic,’ a
simple euphonic prefix, as in ἄποινα
(ποινή), ἀστήρ (Eng. ‘star’).