Vy°
Vy°,is the semi-vowel (i.e.half-consonantic) form of vi° before following a & ā (vya°,vyā),very rarely ū & o.The prefix vi° is very unstable,and a variety of forms are also attached to vy°,which,after the manner of all consonant-combns in Pāḷi,may apart from its regular form vy° appear either as contracted to vv° (written v°),like vagga (for vyagga),vaya (for vyaya),vosita (=vyosita),*vvūha (=vyūha,appearing as °bhūha),or diaeretic as viy° (in poetry) or veyy° (popular),e.g.viyañjana,viyārambha,viyāyata; or veyvañjanika,veyyākaraṇa,veyyāyika.It further appears as by° (like byaggha,byañjana,byappatha,byamha,byāpanna,byābādha etc.).In a few cases vya° represents (a diaeretic) vi°,as in vyamhita & vyasanna; and vyā°=vi° in vyārosa.(Page 652)