The Collaborative International Dictionary of English v.0.48:

Entail \En*tail"\, n. [OE. entaile carving, OF. entaille, F., an
   incision, fr. entailler to cut away; pref. en- (L. in) +
   tailler to cut; LL. feudum talliatum a fee entailed, i. e.,
   curtailed or limited. See Tail limitation, Tailor.]
   1. That which is entailed. Hence: (Law)
      (a) An estate in fee entailed, or limited in descent to a
          particular class of issue.
      (b) The rule by which the descent is fixed.
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                A power of breaking the ancient entails, and of
                alienating their estates.         --Hume.
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   2. Delicately carved ornamental work; intaglio. [Obs.] "A
      work of rich entail." --Spenser.
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The Collaborative International Dictionary of English v.0.48:

Entail \En*tail"\, v. t. [imp. & p. p. Entailed; p. pr. & vb.
   n. Entailing.] [OE. entailen to carve, OF. entailler. See
   Entail, n.]
   1. To settle or fix inalienably on a person or thing, or on a
      person and his descendants or a certain line of
      descendants; -- said especially of an estate; to bestow as
      an heritage.
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            Allowing them to entail their estates. --Hume.
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            I here entail
            The crown to thee and to thine heirs forever.
                                                  --Shak.
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   2. To appoint hereditary possessor. [Obs.]
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            To entail him and his heirs unto the crown. --Shak.
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   3. To cut or carve in an ornamental way. [Obs.]
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            Entailed with curious antics.         --Spenser.
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WordNet (r) 3.0 (2006):

entail
    n 1: land received by fee tail
    2: the act of entailing property; the creation of a fee tail
       from a fee simple
    v 1: have as a logical consequence; "The water shortage means
         that we have to stop taking long showers" [syn: entail,
         imply, mean]
    2: impose, involve, or imply as a necessary accompaniment or
       result; "What does this move entail?" [syn: entail,
       implicate]
    3: limit the inheritance of property to a specific class of
       heirs [syn: fee-tail, entail]