o-
1
Chemistry
1.
an abridgment of
ortho-
.
o-
2
1.
variant of
ob-
before
m:
omission.
o-
3
1.
variant of
oo-
:
oidium.
British Dictionary definitions for
o-
o-
prefix
1.
short for
ortho-
(sense 4)
o-
in Medicine
o-
abbr.
ortho-
(often italic)