D defs.my
Entry 2 senses Webster, 1913

dumbbell

/dŭm'-bĕlˌ/ · dumb·bell · IPA /ˈdʌm.bɛl/
01 n. An exercising weight, consisting of two spheres or spheroids, connected by a short bar for a handle; used (often in pairs) for gymnastic ex…
  1. 1.
    An exercising weight, consisting of two spheres or spheroids, connected by a short bar for a handle; used (often in pairs) for gymnastic exercise.
  2. 2.
    An ignorant or foolish person.