Surfactant
Part of speech: noun
Definition: A surface active agent, or wetting agent, capable of reducing the surface tension of a liquid; typically organic compounds having a hydrophilic "head" and a hydrophobic "tail". A lipoprotein in the tissues of the lung that reduces surface tension and permits more efficient gas transport.
Wetter
Part of speech: adjective
Definition: Made up of liquid or moisture, usually (but not always) water.
Part of speech: noun
Definition: Agent noun of wet; someone who wets something as part of some process.A wetting agent or surfactant.A bedwetter.