coun·ter·es·pi·o·nage 
(koun′tər-ĕspē-ə-näzh′, -nĭj)
(koun′tər-ĕspē-ə-näzh′, -nĭj)n.
Espionage undertaken to detect and counteract enemy espionage.
- subsolar
- subsonic
- subsp.
- subspecialist
- subspecialization
- subspecialize
- subspecialty
- subspecies
- subspecific
- subst.
- substage
- substance
- substance abuse
- substance abuser
- substance P
- substance use disorder
- substandard
- substantia gelatinosa
- substantial
- substantiality
- substantially
- substantialness
- substantia nigra
- substantiate
- substantiation