Christmas tree (bill) is an entry in The Second Barnhart Dictionary of New English (c. 1980) and in 12,000 Words (Merriam-Webster, c. 1986). In the 1989 edition of The Longman Register of New Words, there is an entry for this. Regards, David Barnhart The Barnhart New-Words Concordance (c. 1994; edition 2000) barnhart at highlands.com www.highlands.com/Lexik