Webster's 1828 Dictionary
PROCESSIONARY
a.Consisting in procession; as processionary service.
Webster's 1913 Dictionary
PROCESSIONARY
Pro *ces "sion *a *ry, a. Etym: [Cf. LL. processionarius, F.processionnaire.]
Defn: Pertaining to a procession; consisting in processions; as, processionary service. Processionary moth (Zoöl.), any moth of the genus Cnethocampa, especially C. processionea of Europe, whose larvæ make large webs on oak trees, and go out to feed in regular order. They are covered with stinging hairs.
New American Oxford Dictionary
processionary
pro |ces ¦sion |ary |prəˈsɛʃ (ə )n (ə )ri | ▶noun (also processionary moth ) ( pl. processionaries ) a 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 ). • (also processionary caterpillar ) the larva of the processionary moth.
Oxford Dictionary
processionary
pro |ces ¦sion |ary |prəˈsɛʃ (ə )n (ə )ri | ▶noun (also processionary moth ) ( pl. processionaries ) a 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 ). • (also processionary caterpillar ) the larva of the processionary moth.
The Wordsmith Dictionary