Source : Webster's Revised Unabridged Dictionary (1913)

Bagworm \Bag"worm`\, n. (Zo["o]l.)
   One of several lepidopterous insects which construct, in the
   larval state, a baglike case which they carry about for
   protection. One species ({Plat[oe]ceticus Gloveri}) feeds on
   the orange tree. See {Basket worm}.