D defs.my
Entry 1 sense Webster, 1913

spanworm

/(spăn"wûrm`)/ · span·worm · IPA
01 n. The larva of any geometrid moth, as the cankerworm; a geometer; a measuring worm.
  1. 1.
    The larva of any geometrid moth, as the cankerworm; a geometer; a measuring worm.(Zool.)