pot·a·mo·ge·to·na·ce·ae \ˌ ̷ ̷ ̷ ̷ ̷ ̷ˌjēd.əˈnāsēˌē\noun plural Usage: capitalized Etymology: New Latin, from Potamogeton, type genus + -aceae : a family of aquatic herbs (order Naiadales) having floating or submerged leaves, simple flowers without a perianth, and a fruit like a nut or a drupe • pot·a·mo·ge·to·na·ceous\| ̷ ̷ ̷ ̷ ̷ ̷| ̷ ̷ ̷ ̷|nāshəs\adjective