The Collaborative International Dictionary of English v.0.48:

Elongate \E*lon"gate\, v. t. [imp. & p. p. Elongated; p. pr. &
   vb. n. Elongating.] [LL. elongatus, p. p. of elongare to
   remove, to prolong; e + L. longus long. See Long, a., and
   cf. Eloign.]
   1. To lengthen; to extend; to stretch; as, to elongate a
      line.
      [1913 Webster]

   2. To remove further off. [Obs.] --Sir T. Browne.
      [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Elongate \E*lon"gate\, v. i.
   To depart to, or be at, a distance; esp., to recede
   apparently from the sun, as a planet in its orbit. [R.]
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Elongate \E*lon"gate\, a. [LL. elongatus.]
   Drawn out at length; elongated; as, an elongate leaf. "An
   elongate form." --Earle.
   [1913 Webster]

WordNet (r) 3.0 (2006):

elongate
    adj 1: (of a leaf shape) long and narrow [syn: linear,
           elongate]
    2: having notably more length than width; being long and
       slender; "an elongate tail tapering to a point"; "the old
       man's gaunt and elongated frame" [syn: elongate,
       elongated]
    v 1: make long or longer by pulling and stretching; "stretch the
         fabric" [syn: elongate, stretch]

Moby Thesaurus II by Grady Ward, 1.0:

27 Moby Thesaurus words for "elongate":
   continue, drag out, draw, draw out, elongated, extend, extended,
   lengthen, lengthen out, lengthened, lengthy, let out, long,
   produce, prolong, prolongate, protract, pull, spin out, strain,
   stretch, stretch out, string, string out, tauten, tense, tighten