n. Any part of a mathematical instrument that slides backward and forward upon another part, as the piece in an equinoctial ring-dial that slides to the day of the month, or the point that slides along a beam-compass, etc.n. In medieval universities, a bachelor of theology appointed to assist a master by reading to the class the text of the sentences, with explanations of the meaning, sentence by sentence. See bachelor, 2.n. Same as Cursorius.