Stiffened Paper Material, Also Comes Corrugated
Puzzle 7 of Babysitting Piece of Cake Pack
Question is: Stiffened Paper Material, Also Comes Corrugated
and the answer is: CARDBOARD
Word Meaning:
CARDBOARD — A wood-based material resembling heavy paper, used in the manufacture of boxes, cartons and signs.
Definitions from Wiktionary.