1. a pillar, a post Vin.i.276; DN.i.50 (majjhimaṃ ˚ṃ nissāya), DN.ii.85 (id.); Snp.214; Vv.78#2 (veḷuriya˚, of the pillars of a Vimāna); Pv.iii.3#1 (id.); Dhp-a.iv.203; Vv-a.188 (+ tulā-gopānasī); Pv-a.186.
2. (fig.) in all meanings of thaddha, applied to selfishness, obduracy, hypocrisy & deceit; viz. immobility, hardness, stupor, obstinacy (cp. Ger. “verstockt”): thambho ti thaddha-bhāvo Snp-a.288, Snp-a.333; th. thambhanā thambhittaṃ kakkhaliyaṃ phāruliyaṃ ujucittatā (an˚?) amudutā Vb.350
   ■ Often combined w. māna (= arrogance), freq. in set sāṭheyyaṃ th. sārambho māno, etc. AN.i.100, AN.i.299 = Nd ii.under rāga = Mil.289; cp. MN.i.15
   ■ AN.iii.430 (+ māna), AN.iv.350, AN.iv.465 (+ sāṭheyya); Snp.245 (+ mada), Snp.326, Snp.437 (as one of Māra’s combatants: makkho th. te aṭṭhamo) Ja.i.202.
3. a clump of grass MN.i.324; cp. thambhaka.

see etym. under thaddha; occasionally spelt thamba, viz. AN.i.100; MN.i.324; Pv-a.186, Pv-a.187