ˈfränəmə noun
Usage: capitalized
Etymology: New Latin, from Greek phronimos sane, sensible; probably akin to Greek phren-, phrēn diaphragm, mind — more at frenetic
: a genus (the type of the family Phronimidae) of pelagic amphipod crustaceans having one known member ( P. sedentaria ) that lives in a barrel-shaped case made from the swimming bell of a siphonophore or the test of a tunicate