{ Sub′a‐quat″ic (?), Sub‐a″que‐ous (?), } a. 1. Being under water, or beneath the surface of water; adapted for use under water; submarine; as, a subaqueous helmet.
2. (Geol.) Formed in or under water; as, subaqueous deposits.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.