pycnometers is pycnometer's Plural Form

pycnometer

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UK 
  • n.【物】比重瓶;比重管;比重计
  • Web比重瓶法;全自动真密度分析仪;密度仪
Plural Form:pycnometers  
n.
1.
【物】比重瓶;比重管;比重计