Source : Webster's Revised Unabridged Dictionary (1913)

Spindleworm \Spin"dle*worm`\, n. (Zo["o]l.)
   The larva of a noctuid mmoth ({Achatodes ze[ae]}) which feeds
   inside the stalks of corn (maize), sometimes causing much
   damage. It is smooth, with a black head and tail and a row of
   black dots across each segment.