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Adjective: massless  mas-lus
  1. Having no mass
    "Of course, since the axions are massless, this configuration would store no energy"

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masseur
masseuse
massicot
massicotite
massif
Massif Central
Massine
massive
massively
massiveness
massless
mass-market
Massorete
mass-produce
mass-produced
mass-spectrometric
massy
mast
mast cell
mastaba
mastabah