Definition of monohydrogen in English:

monohydrogen

Pronunciation /ˌmɒnə(ʊ)ˈhʌɪdrədʒ(ə)n/

adjective

Chemistry
  • Attributive Designating compounds containing one hydrogen atom or ion for each combining radical or ion.

Origin

Late 19th century; earliest use found in Henry Roscoe (1833–1915), chemist and university administrator. From mono- + hydrogen.