Go to 'thermo-' entry Go to 'dino-' entry Go to 'chondro-' entry Go to 'aero-' entry Go to '-logy' entry Go to 'thaumato-' entry Go to 'nano-' entry Go to '-sophy' entry Go to 'bucco-' entry Go to '-ism' entry Go to '-lysis' entry Go to 'galacto-' entry Go to '-anthropy' entry Go to 'pneumo-' entry Go to '-ploitation' entry Go to '-lithic' entry Go to '-sepalous' entry Go to 'onco-' entry Go to '-parous' entry Go to 'dermato-' entry Go to 'multi-' entry Go to 'dodeca-' entry Go to '-zoon' entry Go to 'vermi-' entry Go to 'crystallo-' entry Go to 'biblio-' entry Go to 'eco-' entry Go to 'juxta-' entry Go to 'facio-' entry
Affixes: the building blocks of English
Affixes: the building blocks of English

ind(o)-2 Also indi-.

A chemical substance related to indigo or an indole.

[English indigo, via Portuguese from Greek indikos, of India.]

Indigo is a tropical plant from which a blue dye is obtained; its main constituent is a crystalline compound either called indigotin or indigo blue, which also occurs in woad; indirubin, indigo red, is an isomer. Sometimes indo- refers to the colour, as in indicolite, an indigo-blue gem variety of tourmaline, or the element indium, called that because there are two characteristic indigo lines in its spectrum.

Indole is a crystalline organic compound with an unpleasant odour, present in coal tar and in faeces, first obtained artificially from indigo blue; indene (indole plus -ene1) is a colourless liquid hydrocarbon, obtained from coal tar and used in making synthetic resins; the indoxyl radical —ONC8H6 is derived from indole and is present in indigotin; indoleacetic acid is an acetic acid derivative of indole, especially found in plants.

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