The children watched in alarm as a line of processionary caterpillars crossed the garden path.

Her doctoral dissertation focused on processionism and its implications for ecumenical dialogue between Eastern and Western churches.

During summer walks, I warned my neighbors about the health risks posed by oak processionary moths on the old oaks.

The processionist walked at the front, carrying a vibrant flag and leading the chanting through the crowded streets.

The processionists moved slowly through the rain, carrying lanterns and humming ancient hymns.