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.
A drop shipper is anyone who will ship a product for you directly to your customer. So itâs possible for both a manufacturer and a wholesaler to be a drop shipper. If you find a manufacturer who is willing to ship their products directly to customers for you (rare), they will be acting as a drop shipper.