Lewis Short
(adjective) : prae-tĕnŭis, e
* Very thin or slender (post-Aug.): folium pinūs,Plin. 16, 10, 16, § 38: fila,id. 16, 31, 56, § 128; 19, 6, 34, § 116: bracteae,id. 33, 6, 32, § 100: pons,very narrow,id. 8, 50, 76, § 201.—*
* Of sound, very thin or shrill, Quint. 11, 3, 41.
Charlton T. Lewis, Charles Short, A Latin Dictionary