The headword, presumably extracted from the quotation given, is the present middle/passive participle, masculine accusative (and neuter nominative, vocative, and accusative) singular, of the verb paraba/llw, I throw beside. See also pi 270, pi 271, pi 272, pi 273, pi 275, pi 276, pi 278, pi 279, pi 280, pi 281, pi 513, and generally LSJ s.v.
[1] Synesius, Letters 61.6-7 (Hercher). In a letter to his friend Pylaemenes (advocate at Constantinople 402-413; PLRE s.v.) the neo-Platonist philosopher and Christian bishop Synesius (c. 370-c.413; PLRE s.v. Synesius 1, OCD(4) s.v., and sigma 1511) of Cyrene (Barrington Atlas map 97 grid C1; near modern-day Shahhat, Libya) explains his belated transfer of an Egyptian rug promised to the shorthand writer Asterius (exceptor at Constantinople 399-402; PLRE s.v. Asterius 2).