The Collaborative International Dictionary of English v.0.48:

Bodkin \Bod"kin\ (b[o^]d"k[i^]n), n. [OE. boydekyn dagger; of
   uncertain origin; cf. W. bidog hanger, short sword, Ir.
   bideog, Gael. biodag.]
   1. A dagger. [Obs.]
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            When he himself might his quietus make
            With a bare bodkin.                   --Shak.
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   2. (Needlework) An implement of steel, bone, ivory, etc.,
      with a sharp point, for making holes by piercing; a
      stiletto; an eyeleteer.
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   3. (Print.) A sharp tool, like an awl, used for picking out
      letters from a column or page in making corrections.
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   4. A kind of needle with a large eye and a blunt point, for
      drawing tape, ribbon, etc., through a loop or a hem; a
      tape needle.
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            Wedged whole ages in a bodkin's eye.  --Pope.
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   5. A kind of pin used by women to fasten the hair.
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   To sit, ride, or travel bodkin, to sit closely wedged
      between two persons. [Colloq.] --Thackeray.
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The Collaborative International Dictionary of English v.0.48:

Bodkin \Bod"kin\, n.
   See Baudekin. [Obs.] --Shirley.
   [1913 Webster]

WordNet (r) 3.0 (2006):

bodkin
    n 1: a dagger with a slender blade [syn: poniard, bodkin]
    2: formerly a long hairpin; usually with an ornamental head
    3: a small sharp-pointed tool for punching holes in leather or
       fabric
    4: a blunt needle for threading ribbon through loops [syn:
       bodkin, threader]