rigidize

[ rij-i-dahyz ]
/ ˈrɪdʒ ɪˌdaɪz /

verb (used with object), rig·id·ized, rig·id·iz·ing.

to make rigid, as through special processing or the addition of chemicals, plastics, etc.: rigidized aluminum.
Also especially British, rig·id·ise.

Origin of rigidize

First recorded in 1945–50; rigid + -ize