Learn how to say Quantal correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word quantal:
composed of discrete units; varying in steps rather than continuously:
a quantal release of neurotransmitter
Physics relating to a quantum or quanta, or to quantum theory.
chiefly Physiology relating to or denoting an all-or-none response or state.
early 20th century: from quantum + -al