- outrageously
- ozonides
- on the prowl
- one who is performing an
- ordeal
- old man —lord vishṉū
- one who digests everything
- of outstanding merit
- one who has attained puberty
- orange tortrix
- oreopithecus
- olfactory tubercle
- ovarian denervation
- Osmundaceae
- Ophioglossaceae
- ozawa
- occupational dermatitis
- onycholysis
- open_angle glaucoma
- off_colour
- oophorectomise
- one hundred eighty
- one immediately below or after the other
- one hundred sixty_five
- open_chain
- oxidoreductase
- operon
- one who knows and follows ethical laws
- osteotome
- oil of pine
- one who persuades
- one who introduces (something new)
- operation time
- operation desert storm
- operation number
- orthopaedic table
- orthopedical
- or even kissing
- optimal emulsion stability
- optimal activity
- optimal genotype
- one who strikes at the most vulnerable point
- one who knows the inner meaning
- one who (or that which) enlightens
- one_and_one
- on the tiles
- oxypurin
- ochreate
- oxycephalysyndactyly
- orwell