- omar khayyam
- ossein
- orninthology
- odmen catheter
- one of the most important indian rivers (considered to be sacred by the hindus)
- obstetric palpation
- octroi_post
- octroi duty
- ochronosis
- ovenready
- obstructive atelectasis
- on the stocks
- of imposing stature
- organdie
- organdy
- on the distaff side
- optic atrophy
- one who faithfullyobserves strict celibacy from the sacred thread ceremony till the end while residing at the preceptor's hermitage
- ointment tube
- operate on
- operating room
- operating table
- one of the eight recognized types of marriages prescribed by the hindu law_giver
- overemphasis
- overburdened
- oily or greasy
- ophthalmometroscope
- open onto
- one's gorge to rise at
- oops
- on_line processing
- orientate
- of utility
- of or pertaining to
- of tender age
- oligodendrocyte
- overrate
- oestrogenic hormone
- osteophore
- operation field
- operation expression
- of steady mind
- oedipis complex
- of raisin
- out of hand
- one thousand times
- oleated mercury
- oleum anisi
- overwhelmed by passion
- once again