—v.i. 1. to pursue some special line of study, work, etc.; have a specialty: The doctor specializes in gastroenterology. 2. Biol.(of an organism or one of its organs) to be adapted to a special function or environment.
—v.t. 1. to render special or specific; invest with a special character, function, etc.
2. to adapt to special conditions; restrict to specific limits.
3. to restrict payment of (a negotiable instrument) by endorsing over to a specific payee.
4. to specify; particularize. Also,esp. Brit.,spe'cial•ise".