What does allicin mean?
Allicin is a pungent, sulfur-bearing organic compound with the formula C6H10OS2 that forms naturally in garlic when its tissues are damaged. Intact garlic cloves contain the odorless precursor alliin, but crushing, chopping, or chewing brings it into contact with the enzyme alliinase, which converts it into allicin within seconds — producing the sharp smell and taste associated with fresh garlic. First isolated by researchers in the mid-1940s, allicin attracted scientific attention for its antimicrobial, antifungal, and antioxidant properties, and it remains central to research into garlic's possible cardiovascular and immune-related benefits. The compound is chemically unstable, breaking down quickly into other sulfur compounds, especially when heated, so cooked garlic contains little of it. Allicin is discussed chiefly in chemistry, nutrition, and health contexts rather than everyday speech, and the name derives from the botanical genus Allium, which includes garlic, onions, and leeks.
nounA pungent, sulfur-containing organic compound (C6H10OS2) produced in garlic when the enzyme alliinase acts on alliin, responsible for garlic's characteristic odor and much of its antimicrobial activity.
- The organosulfur compound formed in damaged garlic that gives it its pungent odor and contributes to its antimicrobial and medicinal properties.
"Crushing a clove of garlic releases allicin, the compound behind both its sharp aroma and its reputed health benefits."
"Researchers measured the allicin yield of different garlic preparations to assess their potential antimicrobial effect."
"Because allicin degrades rapidly on heating, raw crushed garlic delivers far more of it than cooked."
Rarely pluralized; 'allicins' appears occasionally in technical literature to refer to multiple allicin-type compounds or derivatives, but standard usage treats allicin as uncountable.
"The extract was analyzed for its content of various allicins and related thiosulfinates."
Garlic has no allicin until you crush it — the compound is created on the spot as a chemical defense, which is why fresh-crushed cloves smell far stronger than whole ones.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of allicin
The word allicin was coined in the mid-20th century, following its isolation and characterization by American chemists in 1944. It combines Allium, the Latin botanical genus name for garlic and related plants, with the suffix -in commonly used for chemical substances. It thus belongs to a family of terms built on the same root, including alliin, its odorless precursor, and alliinase, the enzyme that converts one into the other.
Related word forms
How allicin is actually used
Allicin is a technical term used mainly in chemistry, nutrition science, food science, and health writing; it rarely appears in casual conversation. It is always treated as an uncountable mass noun in scientific usage.
Easily confused with allicin
Alliin is the stable precursor amino acid found in intact garlic, while allicin is the reactive compound formed enzymatically when garlic is crushed or chopped.