| formaldehyde | | |
| n. (substance) | 1. formaldehyde, methanal | a colorless poisonous gas; made by the oxidation of methanol. |
| ~ aldehyde | any of a class of highly reactive chemical compounds; used in making resins and dyes and organic acids. |
| ~ gas | a fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely. |
| formalin | | |
| n. (substance) | 1. formalin, formol | a 10% solution of formaldehyde in water; used as a disinfectant or to preserve biological specimens. |
| ~ solution | a homogeneous mixture of two or more substances; frequently (but not necessarily) a liquid solution.; "he used a solution of peroxide and water" |
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