A generic term referring to condensed matter restricted in one dimension.
PAC, 1994, 66, 1667
(Thin films including layers: terminology in relation to their preparation and characterization (IUPAC Recommendations 1994))
on page 1671
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook