Relating to, living in, or adapted for life in water; a rare or archaic variant of 'aquatic.'
From Latin 'aqua' (water) plus the suffix '-ile' (having the quality of), though 'aquatile' is extremely rare in modern English compared to 'aquatic.'
The suffix '-ile' creates wonderfully weird adjectives in English (volatile, docile, senile)—'aquatile' is a linguistic oddity that lost the competition with 'aquatic'!
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