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Oakmoss -
A resinous substance exuded from lichen, usually found around oak trees. Odor or Odour: Airborne chemicals emanating from water, objects, one’s body, flowers or fragrance that stimulate the olfactory system. The characteristic smell of something.

Odor Memory
The ability of a perfumer to hold, and bring to recall, hundreds of single perfume odors and odor blends.

Odor Memory -
The ability of a perfumer to hold, and bring to recall, hundreds of single perfume odors and odor blends.

Odor or Odour -
Airborne chemicals emanating from water, objects, one's body, flowers or fragrance that stimulate the olfactory system. The characteristic smell of something.

Odorant -
Substance that stimulates the sense of smell.

Odoriferous -
Emitting an odor.

Olfaction -
Relating to the sense of smell.

Olfactometer -
1) An instrument for measuring the sense of smell by issuing known concentrations of odorous materials. 2) An instrument using human olfactory senses to measure the odor intensity of a known concentration of an odorous substance.

Olfactory (adj.) –
Relating to, or concerned with, the sense of smell.

Olfactory Bulb –-
The first region of the brain to receive sensory inputs from the olfactory epithelium. The olfactory bulb presents the initial input and communicates via multiple pathways with numerous other regions of the brain, e.g. limbic system, hypothalamus and cortex.

Olfactory Detection Threshold –
The lowest concentration that a specific volatile substance that can be detected as different from an odorless background.

Olfactory Epithelium -
Layer of sensory cells in the upper-rear portion of the nose. Each side of the nose contains roughly 15 million sensory cells in the epithelium.

Olfactory Recognition Threshold –
The lowest concentration of a vapor at which a specific odor characteristic can be recognized. For example, the recognition threshold for vanilla is the lowest concentration of its vapor that can be recognized as being vanilla.

Organ (Perfume) -
Refers to a unit of semi-circular stepped shelving containing hundreds of bottles of raw materials. Arrangement is in a way to assist the perfumer in the creation of perfume compositions.

Oriental -
Fragrance family or type devoting heavy, full bodied and tenacious perfumes. Amber notes are dominant in this category.