The Collaborative International Dictionary of English v.0.48:

Termer \Term"er\, n.
   1. One who resorted to London during the law term only, in
      order to practice tricks, to carry on intrigues, or the
      like. [Obs.] [Written also termor.] --B. Jonson.
      [1913 Webster]

   2. (Law) One who has an estate for a term of years or for
      life.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Termor \Term"or\, n. (Law)
   Same as Termer, 2.
   [1913 Webster]

Bouvier's Law Dictionary, Revised 6th Ed (1856):

TERMOR. One who holds lands and tenements for a term of years or, life.
Litt. sect. 100; 4 Tyr. 561.