The Collaborative International Dictionary of English v.0.48:

Strobila \Stro*bi"la\, n.; pl. Strobilae. [NL., fr. Gr. ?
   anything twisted, a pine cone.] (Zool.)
      (a) A form of the larva of certain Discophora in a state
          of development succeeding the scyphistoma. The body of
          the strobila becomes elongated, and subdivides
          transversely into a series of lobate segments which
          eventually become ephyrae, or young medusae.
      (b) A mature tapeworm.
          [1913 Webster]