Webster's English Dictionary

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boss

1. boss \'ba:s, 'bo.s\ n [ME boce, fr. OF, fr. (assumed) VL bottia] 1a: a 
   protuberant part or body  1b: a raised ornamentation : STUD  1c: an 
   ornamental projecting block used in architecture  2: a soft pad used in 
   ceramics and glassmaking  3: the enlarged part of a shaft 
2. boss vt 1: to ornament with bosses : EMBOSS  2: to treat (as the surface 
   of porcelain) with a boss 
3. boss \'bo.s\ \-d*m\ \-.iz-*m\ n [D baas master; akin to Fris baes 
   master] 1: one who exercises control or authority; specif : one who directs 
    or supervises workers 2a: a politician who controls votes in a party 
   organization or dictates app ointments or legislative measures 2b: an 
   official having dictatorial authority over an organization  - boss.dom n
4. boss \'bo.s\ aj 1: PRINCIPAL, MASTER  slang  2: EXCELLENT 
5. boss \'bo.s\ vt 1: DIRECT, SUPERVISE  2: ORDER 
6. boss \'bo.s\ n [E dial., young cow] : COW, CALF