formic acid

colourless acid used in textile finishing, etc originally obtained from ants but now produced synthetically 甲酸; 蚁酸.

fork, forlorn, forlornly, forlornness, form, form-blaind, formal, formaldehyde, formalin, formalism, formality, formalization, formalisation, formalize, formalise, formally, format, formation, formative, formed, former, formerly, Formica, formidable, formidably, formless, formlessly, formula, formulaic, formulate, formulation, fornicate, fornication, forsake, forsaken, forseeable, forswear, forsythia, fort, forte, forth, forthcoming,