As adjectives the difference between octoic and octic
is that octoic is pertaining to, derived from, or resembling octane; used specifically to designate any of a group of acids including caprylic acid while octic is of the eighth degree or order.
As a noun octic is
a quantic of the eighth degree.
octoic
English
Adjective
(
-)
(chemistry) Pertaining to, derived from, or resembling octane; used specifically to designate any of a group of acids including caprylic acid.
(
Webster 1913)
octic
English
Adjective
(-)
Of the eighth degree or order.
Noun
(
en noun)
A quantic of the eighth degree.