Definition of processionary in English:

processionary

Line breaks: pro|ces¦sion|ary
Pronunciation: /prəˈsɛʃ(ə)n(ə)ri
 
/

noun

(also processionary moth) (plural processionaries)
1A greyish moth whose caterpillars live communally in silken tents in trees, marching out at night in procession to feed, causing substantial damage.
  • Family Thaumetopoeidae: several species, in particular the European pine processionary (Thaumetopoea pityocampa)
1.1 (also processionary caterpillar) The larva of the processionary moth.

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