aqua C1

/əˈkwɑ/ A light blue-green colour, similar to turquoise.

aquamarine C2+

/ˌækwəməˈrin/ a pale blue-green gemstone, or its colour

subaquatic C2+

/ˌsʌbəˈkwætɪk/ existing or occurring under water

subaqueous C2+

/sʌbˈeɪkwiəs/ formed, found, or taking place under water