transverse relaxation optimized spectroscopy 

Initialism: TROSY
https://doi.org/10.1351/goldbook.08437
Measurement method of nuclear magnetic resonance spectroscopy, usually in protein NMR, that improves peak sharpness for molecules having a molecular mass of greater than \(\pu{100 kDa}\).
Note:
TROSY relies on the cancellation of the dipolar coupling and chemical shift anisotropy (CSA) components of the transverse relaxation (see spin-spin relaxation).
Source:
PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 709 (https://doi.org/10.1515/pac-2019-0203)