It refers to a metal which slowly dissolves in a corrosion reaction and, in so doing, protects a second metal from corrosion (eg. (eg. tin behaving as the sacrificial anode to protect the coupled steel base). (FAO & WHO. 2012. Prevention and Reduction of Food and Feed Contamination, Codex Alimentarius. https://www.fao.org/3/i2556e/i2556e.pdf)
‘Watercourse’ means a system of surface waters and groundwaters constituting by virtue of their physical relationship a unitary whole and normally flowing into a common terminus. (http://www.unwatercoursesconvention.org/the-convention/part-i-scope/article-2-use-of-terms/)
Larval stage of crayfish, being a broad thin schizopod larva. (Lawrence, E. (1995) Henderson's dictionary of biological terms. New York, John Wiley & Sons Inc. 693p. 11th ed.)
