Definition of tropaeolin in English:

tropaeolin

(also tropaeoline, tropeolin)

noun

Chemistry
  • Any of a group of orange and yellow sulphonated azo dyes, some of which are used as pH indicators. Frequently with capital letter, numeral, etc. as a postpositive, denoting a particular dye of this group, as "tropaeolin O".

Origin

Late 19th century; earliest use found in Chemical News. From tropaeolum) + -in, after German Tropäolin. Apparently so called from the resemblance of the colours of the dyes to those of the flowers of some species of Tropaeolum.

Pronunciation

tropaeolin

/trə(ʊ)ˈpiːəlɪn/