Silky envelope spun by the larvae of many insects to protect pupas and by spiders to protect eggs.

Roget 129: infant, babe, baby, babe in arms; nurseling, suckling, yearling, weanling; papoose, bambino; kid; vagitus.    child, bairn [Scot.], little one, brat, chit, pickaninny, urchin; bantling, bratling^†; elf.    youth, boy, lad, stripling, youngster, youngun, younker^†, callant^†, whipster^†, whippersnapper, whiffet [U.S.], schoolboy, hobbledehoy, hopeful, cadet, minor, master.    scion; sap, seedling; tendril, olive branch, nestling, chicken, larva, chrysalis, tadpole, whelp, cub, pullet, fry, callow; codlin, codling; foetus, calf, colt, pup, foal, kitten; lamb, lambkin^†; aurelia^†, caterpillar, cocoon, nymph, nympha^†, orphan, pupa, staddle^†.    girl; lass, lassie; wench, miss, damsel, demoiselle; maid, maiden; virgin; hoyden.    ... show more

Dutch: tonnetje
Polish: kokon

Retreat as if into a cocoon, as from an unfriendly environment.

Wrap in or as if in a cocoon, as for protection.