Link to other library: Jack

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at a glance Jack
\ˈ jak\ n [ME Jacke, familiar term of address to a social inferiorm nickname for Johan John] (1548) (1) A blade having high and/or low butts used to actuate the movement of latch knitting needles. (2) Part of a dobby head designed to serve as a lever in the operation of the harness of a loom. (Elsevier's...