Noun

nucleus; backbone; mainstay; key figure

Noun which may take the genitive case particle 'no', Noun

medium-level; mid-level; middle-ranking; midsize

Noun

main body (of troops); crack troops; select troops

center field; centre field; center fielder; centre fielder

Baseball

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see せんぽう・2