Definitions for ladybugˈleɪ diˌbʌg
Random House Webster's College Dictionary
any of numerous small, round, often brightly colored and spotted beetles of the family Coccinellidae, feeding chiefly on aphids and other small insects but including several forms that feed on plants.
Origin of ladybug:
ladybug, ladybeetle, lady beetle, ladybird, ladybird beetle(noun)
small round bright-colored and spotted beetle that usually feeds on aphids and other insect pests
any of the Coccinellidae family of beetles, typically having a round shape and a colorful shell. Also called ladybird or lady beetle. See w:Coccinellidae for more information.
same as Ladybird