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

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

(p. 189) ōẏārēnṭa warrant, a written order giving official authority for arrest etc. 31)

(p. 189) ōṭakānō, uṭakānō search clumsily and hastily; look for something hurriedly; rummage. 5)

(p. 189) ōṣadhiśālā herbarium. 54)

(p. 189) ōjōna ozone. 3)

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

(p. 189) ōṭā (coll. & dero.) that, it, he, she. 7)

(p. 189) ōlana1 a coming down, descent. 43)

(p. 188) ōjana act of weighing; weight; a unit of weight, a measure; importance, impressiveness; power, strength (নিজের ওজন বুঝে কাজ করা). ওজন করা v. to weigh. ̃-করা a. measured (ওজন-করা কথা). ̃দর n. price according to or determined by weight (and not according to or determined by number). ̃দার n. a weighman, a measurer. 22)

(p. 189) ōlāōṭhā cholera. 49)

(p. 189) ōrē coll. & poet. form of ওকে । int. used in addressing or apostrophizing. 40)

(p. 188) ōki, ōkī expressing: inquisitiveness, amazement, fright etc., what's that. 13)

(p. 189) ōpha expressing amazement, anger, regret, pain, disgust etc.; oh. 23)

(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)