terminal disclaimer

Also "TD": a statement filed by an owner under 35 USC S 253 (paragraph 2) and 37 CFR S 1.321(b) or (c) to disclaim or dedicate to the public the entire term or any portion of the term of a patent or patent to be granted. A TD may be filed for the purpose of overcoming a judicailly created double patenting rejection.

Source: U.S. Patent and Trademark Office.