ratiocinable,a.nonce-wd.|ræʃɪ-, rætɪˈɒsɪnəb(ə)l| [f. ratiocinate v. + -able.] Arrived at or deducible by reasoning. 1916G. B. Shaw Androcles & LionPref. p. lxxxvii, An inveterate Roman Rationalist, always discarding the irrational real thing for the unreal but ratiocinable postulate.