Lewis & Short

tĭgillum, i, n. dim. [tignum].

  1. I. A small piece of wood: clamat suam rem perissede suo tigillo fumus si qua exit foras, i. e. if the least bit of wood is burned in his house, Plaut. Aul. 2, 4, 21.
  2. II. Esp., a little beam, Liv. 1, 26, 13; Cat. 67, 39; Tib. 2, 1, 39; Phaedr. 1, 2, 14; Juv. 7, 46; App. M. 1, p. 109.
    1. B. Sororium Tigillum; v. sororius, II.