The Latin root stimu translates to goad

"Stimu" is not a word in English. "Stimulus" is singular. "Stimuli" is plural.

There are many recently invented "words" that are formed using stimu- as a root: stimu-liar, for example. These have their basis in the US government's stimulus programs. Many such words enter the language and pass from use as society ebbs and flows. When the reach the status of long term wide-spread use, they can become accepted words.

The word stimuli is Latin in origin and the root of the word is stimu.

MRI

Else Rubaek Danielsen has written:

'Magnetic resonance spectroscopy diagnosis of neurological diseases' -- subject(s): Brain, Brain Diseases, Brain chemistry, Diagnosis, Diagnostic use, Diseases, Nuclear magnetic resonance, Nuclear magnetic resonance spectroscopy, Pathology