Without fluid, containing no liquid, or actuated without the use of any liquid: "Relating to or referring to an aneroid barometer that measures air pressure by the action of air."

1. An instrument for measuring atmospheric pressure that operates without liquid: "An aneroid is a device that automatically records changes in air pressure with the movement of a pressure-sensitive element without the use of fluids."
2. Etymology: from Greek a, "without" + neron, "water" + oid, "like".

"The word neron is derived from the Late Greek phrase neron hydor, "fresh water".