Definition of "custos"

custos

noun
plural custodes
1. (obsolete) A warden.
  Quotations
  […] they were commytted to prison & put out of theyr offyces & the Constable of the Towre made custos of the citye.
  c. 1530, John Rastell, The Pastyme of People: The Cronycles of Dyuers Realmys‎, London
  Mr. Tharp, the Custos of the parish, and several other gentlement, accompanied the corps.
  1803, Robert Charles Dallas, The History of the Maroons‎, London: Longman and Rees, Volume 1, Letter 5, p. 148
2. (Roman Catholicism) A monastic superior, who, under the general of his order, has the direction of all the religious houses of the same fraternity in a given district, called a custody of the order.
3. (music, historical) In older forms of musical notation, an indication, at the end of a line of music, of the first note of the next line.