- A protective case of silk or similar fibrous material spun by the larvae of moths and other insects that serves as a covering for their pupal stage.
- A similar natural protective covering or structure, such as the egg case of a spider.
- A protective plastic coating that is placed over stored military or naval equipment.
- Something suggestive of a cocoon in appearance or purpose: "a congressionally mandated process that will gradually strip these institutions of a cocoon of regulations" (Edward Meadows).
v., -cooned, -coon·ing, -coons. v.tr.
To envelop in or as if in a cocoon, as for protection from a harsh or unfriendly environment.
v.intr.
To retreat as if into a cocoon, as for security from a harsh or unfriendly environment.
[French cocon, from Provençal coucoun, diminutive of coco, shell, from Late Latin coccum, from Latin, berry, oak gall, from Greek kokkos, seed, berry.]





