-ˌsil, -ēl noun
( -s )
Etymology: International Scientific Vocabulary nitros- + -yl
1. : the nitroso group, radical, or cation — used especially in names of inorganic compounds
nitrosyl chloride
and coordination complexes — compare nitroprusside
2. : a compound of the nitrosyl radical with a metal analogous to a carbonyl
cobalt tricarbonyl nitrosyl Co(CO) 3 NO