1.Those ascetics (Munies) who practise the Tapa (austerities) of Pariharaviśuddhi (Cāritra) (purifactory conduct through intensive penance) for first six months.
parihārikāḥ prathamataḥ ṣaṇmāsān prastutaṃ tapo vahanti.
(BṛBhā 6474 Vṛ)
See - Nirviśamānakalpasthiti.
2.The ascetic (Muni) who is performing the Parihāra Tapa (Prāyaścitta (expiation));
the duration of this Tapa (penance) is from one to six months.
pāyacchittamaṇāvaṇṇo aparihārio, āvaṇṇo māsātijāva-chammāsiyaṃ so parihario.
(Ni 4.118 Vṛ)
See - Parihāra Tapa.
3.The ascetic, observing diligently the ascetic conduct, who avoids the blemishes such as those related with accepting bhiksā (accepting food etc. by going to houses for collecting them in conformity with the canonical instruction) etc...
parihārikasḥ-piṇdadoṣapariharaṇādudyuktavihāri sādhuḥ.
(ĀCūlāVṛ Pa 324)