Barnacle (slang) in the field in order to correct a design or manufacturing defect. The term appears to have originated from the crustacean barnacle which is an animal that attaches itself to rocks, docks, ships, whales, and other objects where it grows. A barnacle in electronics is something added to the manufactured product. Typically a barnacle on a circuit board is very noticeable, much like the mollusc variety on a rock in the sea. While the term was originally used with electronic hardware, it has also migrated into the software industry where is it is used to describe software that is added
Thomas Barnacle died in 1921, having been nursed during his illness by his estranged wife, Annie. Thomas Barnacle Thomas Barnacle (1846 – 9 July 1921) from Galway, Ireland was the father of Nora Barnacle and father-in-law of the novelist, James Joyce. Barnacle was active in the trade unions from the 1860s to the 1890s. Though illiterate, he had a trade as a well-skilled baker—the family line of work—and was much in demand till the end of his life. He often freelanced beyond the town in such places as Oughterard. He married Annie Honoria Healy in 1881 and they had children Mary, Nora,