A curated reference guide to essential perfumery terminology, from structural composition to chemical aging:
Composition & Architecture
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Accord: A balanced blend of two or more individual fragrance notes or aroma chemicals that fuse to create a completely new, unified olfactory impression (comparable to a musical chord). Example: Amber accord (vanilla, benzoin, and labdanum).
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Note: An individual scent element within a formula (e.g., bergamot, cedarwood, jasmine). Notes are categorized by volatility into top, heart, and base.
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Top Notes (Head): The light, volatile opening notes perceived immediately upon spraying (usually lasting 5–15 minutes), often featuring citrus, herbs, or light fruits.
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Heart Notes (Middle): The core character and theme of the fragrance that emerges after top notes fade, typically dominated by florals, spices, and green notes.
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Base Notes (Drydown): Heavy, slow-evaporating molecules that linger for hours or days, anchoring the composition with woods, resins, ambers, and musks.
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Drydown: The final evolutionary phase of a fragrance on the skin after the top and mid notes have largely dissipated, revealing the true character of the base ingredients.
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Linear Scent: A fragrance designed to smell consistent and unchanging from initial spray to final drydown, without a traditional top-to-base shift.
Chemistry, Aging & Production
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Maceration: The controlled resting period where a freshly diluted fragrance concentrate (oil + alcohol + water) sits in sealed bulk tanks for weeks to let molecules harmonize, chemically stabilize, and dissolve evenly before bottling.
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Maturation: The resting of the pure, undiluted fragrance oil concentrate before alcohol is added, allowing raw aromatics to meld together; colloquially also refers to post-bottling aging over months or years.
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Fixative: A natural or synthetic substance with high molecular weight and low volatility (e.g., oakmoss, labdanum, Ambroxan, Iso E Super) used to slow the evaporation rate of lighter ingredients and extend longevity.
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Solvent: The liquid carrier (typically cosmetic-grade denatured ethanol, water, or carrier oil) used to dissolve and disperse pure aromatic compounds.
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Chill Filtration: The industrial process of cooling a macerated perfume solution to near-freezing temperatures so insoluble waxes and lipids precipitate out and can be filtered, ensuring clarity.
Olfactory Characteristics & Molecules
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Indole / Indolic: An aromatic organic compound naturally present in white flowers (jasmine, tuberose, orange blossom, gardenia). In trace amounts, it provides an opulent, narcotic floral richness; in high concentrations, it carries a distinctive animalic, earthy, or fecal undertone.
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Gourmand: An olfactory family or accord characterized by edible, dessert-like notes (vanilla, caramel, praline, chocolate, roasted tonka bean).
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Animalic: Notes that evoke warm skin, fur, or animal secretions (civet, castoreum, musk, leather), adding raw sensual depth to compositions.
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Chypre: A classic, contrast-rich fragrance structure built on a sparkling citrus opening (bergamot) over a mossy, resinous base (oakmoss, patchouli, labdanum).
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Fougère: An aromatic, barbershop-style fragrance family constructed around the interplay of lavender, oakmoss, and coumarin.
Performance & Sensory Terms
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Sillage: The scent trail or aromatic wake left behind in the air as a wearer moves through a room.
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Projection: The physical distance/radius outward from the body at which a stationary scent can be smelled.
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Olfactory Fatigue (Nose Blindness / Anosmia): The brain’s temporary adaptation to a continuous, unchanging scent, causing the wearer to stop smelling their own perfume while others can still detect it.
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Mouillette (Scent Strip): The absorbent paper blotter used by perfumers and evaluators to test and track the evolution of a fragrance over time.