Synonym of reptile: creeping, crawling.
Reptilious, creeping, crawling, swarming upon the belly, etc.
Synonym of reptilian: reptilelike, of or related to members of the class Reptilia.
The lecturer... pointed out the peculiar difference in the process of breathing which distinguished the reptilious from the aquatic species.
From reptile + -ious, replacing earlier adjectival reptile and reptitious.
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