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.
Dropper Test Kit. The first is a swimming pool water dropper kit that should include readings for chlorine, combined chlorine, pool pH, pool alkalinity, and water hardness. The most widely used type of dropper kit is called the FAS-DPD K-2006 Taylor pool water test kit.