al·li·in·ase
| \ ˈa-lē-ə-ˌnās
\
: an enzyme that catalyzes the conversion of alliin to allicin in plants of the genus Allium (such as garlic and onion)
But as soon as you crush or cut a clove of garlic, an enzyme called alliinase is released, converting alliin into allicin.— Judy Foreman, Boston Globe, 19 Feb. 1996