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.
Poppers is slang for a variety of alkyl nitrites, particularly amyl nitrite. Poppers are available over-the-counter and come in small bottles.Amyl nitrites are generally used in air fresheners and video head cleaners, but are used as a recreational drug to increase sexual arousal.Poppers used to come in small capsules that popped when they were broken, thus the name poppers..oppers are available over-the-counter and come in small bottles. Amyl nitrites are generally used in air fresheners and video head cleaners, but are used as a recreational drug to increase sexual arousal.