Dictionary.net

• An ancient mode of writing, in alternate directions, one line from left to right, and the next from right to left (as fields are plowed), as in early Greek and Hittite.

2010 - New Age Dictionary Database
By Oddity Software

• An ancient mode of writing, in alternate directions, one line from left to right, and the next from right to left (as fields are plowed), as in early Greek and Hittite.

1913 - Webster's Revised Unabridged Dictionary
By Noah Webster.