IPA: /ˈkæp.sɪ.sɪn/
KK: /kæp'sɪsɪn/
A substance that comes from certain types of peppers, often used to add heat or spice to food.
Capsicin is the main ingredient that makes chili peppers hot.
Capsaicin is derived from "capsaicin" (from Latin "capsa", meaning box or container, referring to the pod of the pepper). The word describes the active component found in chili peppers that gives them their heat.
Think of the word 'capsa' meaning 'box' or 'container' — this helps you remember that capsaicin is the substance contained in chili peppers that makes them spicy.