sensitiser sensitised • sensitising · · · Info · Definitions · Synonyms · Characters · · sensitiser · · Text Latin · · Script 10 · · Length 4 · · Syllables Definitions · · · (noun) (chemistry) a substance other than a catalyst that facilitates the start of a catalytic reaction. Synonyms: sensitizer. · · Noun Definition 1 Synonyms · · · sensitizer · · Synonym 1 Characters · · e latin small letter e U+0065 i latin small letter i U+0069 n latin small letter n U+006E r latin small letter r U+0072 s latin small letter s U+0073 t latin small letter t U+0074