The Collaborative International Dictionary of English v.0.48:

accrete \ac*crete"\ ([a^]k*kr[=e]t"), v. i. [From L. accretus,
   p. p. of accrescere to increase.]
   1. To grow together.
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   2. To adhere; to grow (to); to be added; -- with to.
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The Collaborative International Dictionary of English v.0.48:

accrete \ac*crete"\, v. t.
   To make adhere; to add. --Earle.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

accrete \ac*crete"\, a.
   1. Characterized by accretion; made up; as, accrete matter.
      [1913 Webster]

   2. (Bot.) Grown together. --Gray.
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WordNet (r) 3.0 (2006):

accrete
    v 1: grow together (of plants and organs); "After many years the
         rose bushes grew together"
    2: grow or become attached by accretion; "The story accreted
       emotion"