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subcarbonate
subcarbonate n. 
/ˌsʌbˈkɑːbənət/,
Brit. /ˌsʌbˈkɑːbəneɪt/
, /ˌsʌbˈkɑːbəneɪt//ˌsʌbˈkɑːbənət/U.S. /ˌsəbˈkɑrbənət/
/ˌsəbˈkɑrbənət/ΚΠ
1798 Philos. Trans. (Royal Soc.) 88 23 Subcarbonate of potash being dropped into the solution.
1859 N. F. Moore Anc. Mineral. 87 It [sc. coeruleum, a blue pigment] was made by reducing sand mingled with pure nitrum (subcarbonate of soda) to a fine powder..sprinkled with coarse copper filings.
1921 O. T. Osborne Princ. Therapeutics iii. 154 The subcarbonate of bismuth occurs as a yellowish white powder, insoluble in alcohol and water.
2004 Biomaterials 25 1422/2 (table) Silicone containing bismuth subcarbonate.
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