There are four varieties of commercially viable coffee: Arabica, Liberica, Excelsa, and Robusta. Growers predominantly plant the Arabica species. Although less popular, Robusta tastes slightly more bitter and contains more caffeine.
MEMBRANES
Noun
membranes
plural of membrane
(medicine, informal, specifically) The amniotic sac.
Source: Wiktionary
MEMBRANE
Mem"brane, n. Etym: [F., fr. L. membrana the skin that covers the separate members of the body, fr. L. membrum. See Member.] (Anat.)
Definition: A thin layer or fold of tissue, usually supported by a fibrous network, serving to cover or line some part or organ, and often secreting or absorbing certain fluids.
Note: The term is also often applied to the thin, expanded parts, of various texture, both in animals and vegetables. Adventitious membrane, a membrane connecting parts not usually connected, or of a different texture from the ordinary connection; as, the membrane of a cicatrix.
– Jacob's membrane. See under Retina.
– Mucous membranes (Anat.), the membranes lining passages and cavities which communicate with the exterior, as well as ducts and receptacles of secretion, and habitually secreting mucus.
– Schneiderian membrane. (Anat.) See Schneiderian.
– Serous membranes (Anat.) , the membranes, like the peritoneum and pleura, which line, or lie in, cavities having no obvious outlet, and secrete a serous fluid.
Source: Webster’s Unabridged Dictionary 1913 Edition
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