n. & v.
n. 1 a a silky case spun by many insect larvae for protection as pupae. b a similar structure made by other animals. 2 a protective covering, esp. to prevent corrosion of metal equipment.
v. 1 tr. & intr. wrap in or form a cocoon. 2 tr. spray with a protective coating.
[ F cocon f. mod. Prov. coucoun dimin. of coca shell ]