audit opinion
opinion and feeling
negative opinion
jipney
n; vb1; vb2; vb3; vb.ing…
opportunist
opportunism
opposition
opossum
opdon
seller's option
optional
general officer
ship officer
field officer
opthalmometer
opthalmoscope
optic
optics
atmosphere optics
mirror optics
meteorological optics
Gaussian optics
geometric(al) optics
geometrical optics
geometrical optics
crystal optics
molecular optics
Ritchey-Chretien optics
Schmidt optics
