The Collaborative International Dictionary of English v.0.48:

Garnishee \Gar`nish*ee"\, n. (Law)
   One who is garnished; a person upon whom garnishment has been
   served in a suit by a creditor against a debtor, such person
   holding property belonging to the debtor, or owing him money.
   [1913 Webster]

   Note: The order by which warning is made is called a
         garnishee order.
         [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Garnishee \Gar`nish*ee"\, v. t. [imp. & p. p. Garnisheed
   (-[=e]d); p. pr. & vb. n. Garnisheeing.] (Law)
   (a) To make (a person) a garnishee; to warn by garnishment;
       to garnish.
   (b) To attach (the fund or property sought to be secured by
       garnishment); to trustee.
       [1913 Webster]

WordNet (r) 3.0 (2006):

garnishee
    n 1: a wage earner who is served with a garnishment
    v 1: take a debtor's wages on legal orders, such as for child
         support; "His employer garnished his wages in order to pay
         his debt" [syn: garnishee, garnish]

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

GARNISHEE, practice. A person who has money or property in his possession,
belonging to a defendant, which money or property has been attached in his
hands, and he has had notice of such attachment; he is so called because he
has had warning or notice of the attachment.
     2. From the time of the notice of the attachment, the garnishee is
bound to keep the property in his hands to answer the plaintiff's claim,
until the attachment is dissolved, or he is otherwise discharged. Vide Serg.
on Att. 88 to 110; Com. Dig. Attachment, E.
     3. There are garnishees also in the action of detinue. They are persons
against whom process is awarded, at the prayer of the defendant, to warn
them to come in and interplead with the plaintiff. Bro. Abr. Detinue,
passim.