(p. 188) ōn̐cā, ōn̐chā (chiefly coll.) worthless or bad; inferior; contemptible; base, mean; good-for-nothing. 7)

(p. 188) ōkālatanāmā power of attorney. 11)

(p. 188) ō2 that or yonder person or creature or thing, a person or creature or thing in question, he, she, it.  a. that immediately preceding, last (ও মাসে). adv. too, also, moreover (সে খাবেও); even (নামও শুনিনি).  con. and.  int. expressing; a call, recollection, amazement, pity etc.; holla, ho; ah, oh. 3)

(p. 189) ōstāda a trainer, a music-master or music-teacher; a master artist or artisan. a. skilled, expert. ওস্তাদি n. efficiency, skill, mastery; cleverness; an attempt to parade one's skill or mastery, bravado; uncalled-for act of coming forward to help; officiousness. a. pertaining to a trainer or music-master or master artist or master artisan. ওস্তাদি করা v. to try to parade one's skill or mastery; to come forward uncalled-for to help; to be officious. 59)

(p. 189) ōmā expressing: surprise; fear etc. 24)

(p. 189) ōḍ়iẏā a native of Orissa; the language of Orissa. a. of Orissa or its people. 16)

(p. 188) ō1 the tenth vowel of the Bengali alphabet. 2)

(p. 189) ōṭakiśati, ōṭakisti (in chess) a position in which if a particular piece or chessman is moved, the player in question gets a check, and if not moved, that piece or chessman is taken by the adversary. 6)

(p. 189) ōrā ṃōṭā, ṃōrā ṃuṭā orang-utan (orang-outang), an ape originally of Sumatra and Borneo. 39)

(p. 189) ōḍ়iśā Orissa. ওড়িশি a. of or pertaining to Orissa. n. an Indian style of classical dance that originated in Orissa. 17)

(p. 189) ōẏāriśa an heir or heiress. ওয়ারিশান n. pl. heirs or heiresses. 30)

(p. 188) ōcalānō to winnow, to fan (grain etc.) free of husks and chaff. 20)

(p. 188) ōkhāna that or yonder place or region. 16)

(p. 189) ōḍ়ba an Indian musical mode which is expressed by five principal notes. 13)

(p. 189) ōlandāja Dutch. a. a Hollander, a Dutch; the Dutch language. 45)