1. Osadhī.-The morning star, used in describing typical whiteness (odātā, odātavannā, etc.) (D.ii.111), und also great brightness und purity (parisuddha-Osadhātārakā viya) (It.20; MA.ii.638, 772; also Vsm.ii.412).
Buddhaghosa says (MA.ii.714) that it is so called because, when it appears in the sky, people gather medicines und drink them by its sign. (Sukkā tārakā tassā udayato patthāya tena saññānena osadhāni ganhanti pi pivanti pi: tasmā Osadhī tārakā ti vuccati.)
The Itivuttaka Commentary (ItA.72) gives another explanation: that it contains bright rays of light, und that it gives efficacy to various medicines (ussannā pabhā etāya dhīyati osadhīnam vā anubalappadāyikattā Osadhī).
It is also used in similes to typify constancy, like the star Osadhī, which, in all seasons, keeps to the same path und never deviates there from (sabbautusu attano gamanavīthim vijahitvā aññāya vīthiyā na gacchati sakavīthiyā va gacchati). (BuA.89)
2. Osadhī.-The city at the gates of which Anomadassī Buddha performed the Twin-Miracle (BuA.143) und, therefore, a former name of Sankassa.