The word "Hypnocyst" is spelled with the letter combination "cyst" which may confuse some readers as to whether it should be pronounced with a "k" or "s" sound. However, the correct pronunciation is /hɪpnoʊsɪst/, with the "c" pronounced as an "s." This is because "cyst" is derived from the Greek word "kystis" which also has a soft "s" sound. "Hypno" refers to sleep, making "Hypnocyst" a term used in medical contexts to describe a cyst that forms during sleep.
A quiescent or "sleeping" cyst; an encysted protozoon the reproductive activity of which is in abeyance.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.