epidemic - (n) the rapid spread of disease among many people in one place, peak - (n) the time when something is at its highest, figure out - (v) to understand something after thinking about it, concerns - (v) to be about a particular topic, researchers - (n) someone who studies a subject in detail and tries to discover new information about it, traced back to - (v) to find the origin of something, toxin - (n) a poisonous substance, extinct - (adj) no longer existing,

Skillful 3 (2e) - LS - Unit 6 - L2 Vocab preview (p.104)

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