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.
Popper is a slang term for a type of drug. Usually isobutyl nitrite or amyl nitrate. It is often used as an inhalant to increase sexual pleasure. It is sold in small glass bottles in 10ml-30ml sizes.opper is a slang term for a type of drug. Usually isobutyl nitrite or amyl nitrate. It is often used as an inhalant to increase sexual pleasure. It is sold in small glass bottles in 10ml-30ml sizes.