Search moccasin moccasin /mok′äsin/ , any of several species of snakes of the genus Agkistrodon. Water moccasin (John Willson at the Savannah River Ecology Laboratory [SREL]) Tweet Telegram VK Random Words graduated muscular contractions chronic obstructive lung disease ANC infest extroversion -tactic, -tactical, -taxic degeneration (deg) optic nerve organic dust