As adjectives the difference between antarctic and notothenioid
is that antarctic is (obsolete) southern while notothenioid is (zoology) of or pertaining to the perciform suborder notothenioidei, the antarctic icefish.
As a proper noun antarctic
is one of the major ecozones of the world, covering the south polar regions.
notothenioid
English
Adjective
(-)
(zoology) Of or pertaining to the perciform suborder Notothenioidei, the Antarctic icefish.