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Definition: Thunderbird

(1) A full-featured email client that comes with Linux and is also available for Windows and Mac. Thunderbird provides unique features including a Saved Search feature that provides a virtual mailbox based on specific search criteria. For example, all mail from a particular person can be in a Saved Search folder although the physical messages are stored in several other mailboxes.

Like its Firefox Web browser counterpart, Thunderbird also supports "extensions," which are plug-ins that enhance the program. For more information, visit www.mozilla.org. See Firefox and Penelope.

(2) The code name for AMD's 1.1 GHz Athlon processor introduced in August 2000. See AMD.