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I

Incense

notes incorporating sweet, powdery and resinous essences

Entry link: Incense

Indole

Indole is an aromatic heterocyclic organic compound.

It naturally occurs in human feces and has an intense faecal odour. At very low concentrations though, it has a very flowery smell, and is a constituent of many floral scents (such as orange blossoms) and perfumes.

It tends to lend a "dirty" quality to a perfume.
Entry link: Indole

Infusion

whole botanical materials immersed in a hot medium, diluent or carrier; botanical material in warmed oil is considered an infusion

Entry link: Infusion

Insoluble

raw materials (essential oils, resins, absolutes, concretes, etc.) which do not dissolve in a diluent (alcohol, solvent, oil, water, etc.)

Entry link: Insoluble