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metaformaldehyde
metaformaldehyde n. 
/ˌmɛtəfəˈmaldᵻhʌɪd/, /ˌmɛdəˌfɔrˈmældəˌhaɪd/
Brit. /ˌmɛtəfɔːˈmaldᵻhʌɪd/
, /ˌmɛtəfɔːˈmaldᵻhʌɪd//ˌmɛtəfəˈmaldᵻhʌɪd/U.S. /ˌmɛdəfərˈmældəˌhaɪd/
, /ˌmɛdəfərˈmældəˌhaɪd//ˌmɛdəˌfɔrˈmældəˌhaɪd/ΚΠ
1888 Ann. Rep. Board of Regents Smithsonian Inst. (1890) App. 445 in U.S. Congress. Serial Set (50th Congr., 2nd Sess.: House of Representatives Misc. Doc. 142) XIV The oxymethylene, which is with difficulty soluble, is probably metaformaldehyde (CH2O)3.
1897 Amer. Naturalist 31 95 A precipitate of Para- and Metaformaldehyde, insoluble in water at ordinary temperatures, is formed.
1936 I. Heilbron & H. M. Bunbury Dict. Org. Compounds II. 594/2 Metaformaldehyde.
1967 I. L. Finar Org. Chem. (ed. 5) I. viii. 191 When allowed to stand at room temperature, formaldehyde gas slowly polymerises to a white solid, trioxymethylene (metaformaldehyde, trioxan), (CH2O)3.
2006 Nelson's Dir. Investm. Res. 3 242/1 Major chemical products of the Group include synthetic ammonia, urea, ammonium nitrate, pentaerythritol, metaformaldehyde and sodium formate.
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