nuclearity

https://doi.org/10.1351/goldbook.NT06774
The number of @C00930@ joined in a single @C01329@ entity by @B00741@ or metal-metal bonds is indicated by dinuclear, trinuclear, tetranuclear, polynuclear, etc.
Source:
PAC, 1997, 69, 1251. (Glossary of terms used in bioinorganic chemistry (IUPAC Recommendations 1997)) on page 1288 [Terms] [Paper]