JMdict entry #1424090

1. noun (common) (futsuumeishi) nucleus; backbone; mainstay; key figure
2. nouns which may take the genitive case particle 'no'noun (common) (futsuumeishi) medium-level; mid-level; middle-ranking; midsize
3. noun (common) (futsuumeishi) main body (of troops); crack troops; select troops
4. noun (common) (futsuumeishi) baseball center field; centre field; center fielder; centre fielder
5. noun (common) (futsuumeishi) athlete competing in the middle-number match in a team competition, i.e. second in 3-on-3, third in 5-on-5 (kendo, judo, etc.)
   see: 先鋒・せんぽう・2