It's nirodh, sometimes written as nirodha.
It can mean suppression or control, and in the context of meditation
its meaning is often given as cessation.
Here's an extract from an interview with Ken Wilber:
"This is a discrete, identifiable state of awareness--namely,
unmanifest absorption or cessation, variously known as nirvikalpa
samadhi, jnana samadhi, ayin, vergezzen, nirodh, classical nirvana."
Total cessation of consciousness. "
"Beyond the nirvana is the nirodh (cessation), which consists of the
absolute cessation of consciousness and the quiescence of bodily
This glossary of Sanskrit terms defines nirodh and nirodha as "control":
"Nirodha - Restraint, suppression."
Glossary of Sanskrit Words
"Nirodha: Control, restraint, cessation"
I hope this helps, but please let me know if you would like me to
Best Wishes - Leli