Lewis & Short

1. phĭlyra and phĭlŭra, ae, f., = φιλύρα,

  1. I. the linden-tree (pure Lat. tilia): rari (libri) in philyrae cortice subnotati, Mart. Cap. 2, § 136.
  2. II. Transf.
    1. A. The inner bark of the linden-tree, of which bands for chaplets were made: displicent nexae philyris coronae, Hor. C. 1, 38, 2; Ov. F. 5, 337; Plin. 16, 14, 25, § 65; 19, 2, 9, § 31.
    2. B. A sheet of the inner bark of the linden-tree prepared for writing upon, a writing-tablet, Dig. 32, 1, 52 prooem.
    3. C. The skin or rind of the papyrus, Plin. 13, 11, 23, § 74.