Dictionary.net

• a thin paper coated on one side with a dark waxy substance (often containing carbon); used to transfer characters from the original to an under sheet of paper

2006 - WordNet 3.0
By Princeton University

• a thin paper coated on one side with a dark waxy substance (often containing carbon); used to transfer characters from the original to an under sheet of paper

2011 - English Dictionary Database
By DataStellar Co., Ltd