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metagelatin
metagelatin n. 
/ˌmɛdəˈdʒɛlədən/
Brit. /ˌmɛtəˈdʒɛlətɪn/
, /ˌmɛtəˈdʒɛlətɪn/U.S. /ˌmɛdəˈdʒɛlətn/
, /ˌmɛdəˈdʒɛlətn//ˌmɛdəˈdʒɛlədən/ΚΠ
1858 T. Sutton Dict. Photogr. Metagelatine.
1879 Encycl. Brit. X. 131/2 Gelatin so treated [with hot solutions of oxalic acid] has been called metagelatin.
1906 N.E.D. at Meta- Metagelatin, a form of gelatin that remains fluid, used in photography, made by boiling and cooling a solution of gelatin several times.
2007 K. Shyamsundari & K. Hanumantha Rao Histochem. in Focus vi. 88 If heated too much, gelatin gets transformed into metagelatin which will not harden at room temperature.
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