subaqueous
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sub a que ous |səbˈākwēəs, -ˈak- səbˈeɪkwiəs | ▶adjective existing, formed, or taking place underwater. • lacking in substance or strength: the light that filtered through the leaves was pale, subaqueous.
sub |aque ¦ous |sʌbˈeɪkwɪəs | ▶adjective existing, formed, or taking place under water.