Search Result for "hyperfine": 
Wordnet 3.0

ADJECTIVE (1)

1. extremely fine or thin, as in a spectral line split into two or more components;
- Example: "hyperfine structure"



WordNet (r) 3.0 (2006):

hyperfine
    adj 1: extremely fine or thin, as in a spectral line split into
           two or more components; "hyperfine structure"