Glossary

Essential Oil Glossary

Essential oil language can feel technical at first. This glossary explains common aromatherapy, botanical, safety, extraction, and blending terms in plain English, so you can read oil profiles and safety guides with more confidence.

Use this page as a starting point whenever you see a term like dilution, carrier oil, phototoxicity, chemotype, steam distillation, cold pressed, or aroma note. Each entry is written for beginners and careful home users, without brand language or medical promises.

Quick Answer

This glossary collects essential oil terms that appear throughout Essencyclopedia. It is designed to support safer, clearer reading across oil profiles, dilution guides, diffuser guides, DIY recipes, and safety articles.

Essential Oil Glossary Terms

The glossary below is organized by topic so you can find related terms quickly. As the site grows, each term can become its own short glossary page with examples and links to relevant oil profiles.

Safety and Dilution Terms

Dilution

Mixing essential oil into a carrier oil, lotion, cream, balm, or other suitable base before applying it to skin.

Carrier Oil

A fatty plant oil used to dilute essential oils and help spread them more evenly on the skin.

Topical Use

Using an essential oil blend on the skin, usually after proper dilution in a suitable base.

Phototoxicity

A sun-sensitivity concern linked with certain oils, especially some cold-pressed citrus oils used on skin.

Sensitization

A type of skin reaction where the body becomes reactive to a substance after exposure.

Contraindication

A reason to avoid or use extra caution with an oil, method, or ingredient in a specific situation.

Botanical and Extraction Terms

Botanical Name

The Latin scientific name that helps identify the exact plant source of an essential oil.

Plant Family

A botanical grouping that can show relationships between plants, such as Lamiaceae, Rutaceae, or Asteraceae.

Chemotype

A chemically distinct type of oil from the same plant species, often important for aroma and safety.

Steam Distillation

A common extraction method where steam helps release aromatic compounds from plant material.

Cold Pressed

A mechanical extraction method often used for citrus peel oils such as lemon, lime, orange, and bergamot.

Absolute

A concentrated aromatic extract often produced with solvent extraction, commonly used for delicate flowers or resinous materials.

Aroma and Blending Terms

Aroma Family

A broad scent category such as floral, citrus, herbal, minty, woody, resinous, spicy, earthy, or camphoraceous.

Aroma Note

A blending concept that describes whether an aroma behaves more like a top, middle, or base note.

Top Note

A lighter, faster-moving aroma that is usually noticed first and fades more quickly.

Middle Note

An aroma that forms the body of a blend and helps connect lighter and deeper notes.

Base Note

A deeper, slower aroma that can anchor a blend and last longer than many lighter oils.

Fixative

A material that helps slow evaporation and give a natural perfume or aromatic blend more staying power.

How to Use This Glossary

If you are reading an oil profile, use glossary terms to understand the Quick Facts section more clearly. Botanical name, plant family, plant part, extraction method, aroma family, aroma note, and safety notes all become more useful when the terms are familiar.

If you are making a topical blend, start with dilution, carrier oil, topical use, patch test, and sensitization. If you are using citrus oils on skin, read about phototoxicity. If you are comparing oils with similar names, check botanical name, chemotype, plant part, and extraction method.