The word 'toxic' originates from the Greek toxikon pharmakon, meaning 'poison for arrows'. This term derived from toxon (bow), as the poison was specifically applied to arrowheads. The Latin toxicum generalized the meaning to any poison. The modern English adjective 'toxic' retains the core sense of 'poisonous', while its metaphorical extension to describe harmful psychological or social environments follows the logic of a poison spreading its damaging effects.

Structure: tox (poison) + ic (adjective suffix) - tox: From Latin toxicum (poison), from Greek toxikon (poison for arrows), from toxon (bow). - ic: A suffix forming adjectives, from Latin -icus, Greek -ikos, indicating 'of or pertaining to'.