indeclinable
Ādu (indeclinable) [see also adu] emphatic (adversative) particle1. of affirmation and emphasis: but, indeed, rather Ja III {100} 499 = V 180; VI 443; VI 552. 2. as 2nd component of a disjunctive question, mostly in corresponsion udāhu ... ādu (= kiṃ ... udāhu Pj II 350), viz. "is it so ... or" Thag 1274 = Snp 354; Pv IV 3 17 = Dhp-a I 31; Ja V 384; VI 382; without udāhu at Ja V 460 (adu). The close connection with udāhu suggests an explanation of ādu as a somehow distorted abbreviation of udāhu.
or; introducing a second question or the second part of a disjunctive question
【無】 或，但是。
(ind, ind, interr) (second part of a question) or?; or rather? or, but Construction: udāhu > ādu