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.
Definition of:Trojan dropper. Software that injects Trojans, viruses, worms and other malware into a computer. When run, it typically decompresses the malware components hidden within the dropper file and executes them, sometimes without saving them on disk to avoid detection.