Let's Compare Mucosa and Serosa. 1  MUCOSA VS.  Mucosa. The mucous membranes (or mucosae or mucosas; singular mucosa) are linings of mostly endodermal origin, covered in epithelium, which are involved in absorption and secretion. mucosa \mucosa\ n.
Definition of dropper for English Language Learners. : a glass or plastic tube that is used to measure out liquids by drops.
General-purpose, heavy grease/oil for use in high-tension contact areas like semi-auto slides and bolts. Anti-friction properties help prevent surface wear and galling. Dropper bottle lets you apply lubricant one drop at a time, right where you want it. Will not attract and hold contaminants. Recommended for pistols/revolvers, and long guns of all action types. 40Â° to 350Â° operating temperature range.