καταβατικός

ή, όν, Adv.
A. affording a means of descent, Porph. Antr. 22. Adv. ‐κῶς by a descending or deductive process, ψυχὴ ‐κῶς νοοῦσα τὰ πράγματα, opp. ἀθρόως, Olymp. in Alc. p.78C.
Liddell, Scott & Jones
A Greek-English Lexicon, 1940
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