Nirodhaṁ

oppression, suppression; destruction, cessation annihilation (of senses, consciousness, feeling being in general: sankhārā). Bdhgh’s explⁿ of the word is: “ni-saddo abhāvaṃ, rodha-saddo ca cārakaṃ dīpeti Vism.495
■ N. in many cases is synonymous with nibbāna & parinibbāna; it may be said to be even a stronger expression as far as the active destruction of the causes of life is concerned. Therefore frequently combined with nibbāna in formula “sabbasankhāra-samatho… virāgo nirodho nibbānaṃ,” e.g. SN.i.136; Iti.88. Nd ii.s. nibbāna (see nibbāna iii.6). Also in combination with nibbidā, e.g. SN.iii.48, SN.iii.223; SN.iii.163 sq. SN.v.438
■ The opposite of nirodha is samudaya, cp formula “yaṃ kiñci samudaya-dhammaṃ sabban taṃ nirodha-dhammaṃ” e.g. Nd ii.under sankhārā & passim

1. Vin.i.1, Vin.i.10; DN.ii.33, DN.ii.41, DN.ii.57 sq., DN.ii.112; DN.iii.130 sq. DN.iii.136 sq., DN.iii.226 sq.; Ja.i.133; Ja.ii.9 sq., Ja.ii.223; Ja.iii.59 sq., Ja.iii.163, Ja.v.438; MN.i.140, MN.i.263, MN.i.410; AN.i.299; AN.iv.456 (= āsavānaṃ parikkhaya); Thig.6 (= kilesanirodha Thag-a.13), Thag-a.158; Iti.46 = Snp.755 (nirodhe ye vimuccanti te janā maccuhāyino); Iti.62 = Snp.754; Snp.731, Snp.1037; Pts.i.192; Pts.ii.44 sq. Pts.ii.221; Pp.68; Vb.99 sq., Vb.229; Ne.14, Ne.16 sq.; Vism.372; Vv-a.63; Pv-a.220 (jīvitassa)
2. (as-˚): anupubba DN.iii.266; AN.iv.409, AN.iv.456; abhisaññā˚ DN.i.180; asesavirāga˚ SN.ii.4, SN.ii.12; SN.iv.86; SN.v.421 sq.; AN.i.177; AN.ii.158, AN.ii.161 upādāna˚ SN.iii.14; kāma˚ AN.iii.410 sq.; jāti˚ SN.iv.86 taṇhā˚ DN.iii.216; dukkha˚ DN.iii.136; SN.iii.32, SN.iii.60 SN.iv.4 sq., SN.iv.14, SN.iv.384; AN.i.177; nandi˚ SN.iii.14; SN.iv.36; bhava (= nibbāna) SN.ii.117; SN.iii.14; AN.v.9; Pts.i.159; sakkāya DN.iii.240; SN.v.410;