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Having a mass of zero.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.


(General Physics) physics having no mass
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014


(ˈmæs lɪs)

pertaining to an elementary particle, as a photon, having zero rest mass.
mass′less•ness, n.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
References in periodicals archive ?
Release date- 13082019 - The article entitled 'Suppressed Auger scattering and tunable light emission of Landau-quantized massless Kane electrons' was published in 'Nature Photonics' magazine.
In previous experiments at the ALS, Hasan's team had revealed the existence of a type of massless quasiparticles known as Weyl fermions, which had only been known to exist in theory for about 85 years.
Furthermore, mixing quantities such as, LOS, CDI, cumulative distribution of maximum shear stress and particle transfer distribution are calculated by injecting a set of massless particles.
Many of her mosses, she said, come as rescues from sites that are about to be disturbed by construction, or homeowners who want a massless yard or are about to replace a roof.
This warped spacetime terrain bends the paths that massless photons travel.
The idea revolves around neutrinos or the nearly massless particle that doesn't interact with other matter, but acts as its own antiparticle, holding the ability to produce matter as well as antimatter version of itself.
In the sequatial reading [12], we will demonstrate how this formulation of the Dirac equation can be used to explain how massless neutrinos can oscillate.
In the low energy effective action, usually string theory based-models are comprised of two massless scalar fields, the dilaton, and the axion (see, e.g., [1]).
Their topics include the zeta-regularized stress-energy vacuum expectation value in terms of integral kernels, total energy and forces on the boundary, a massless field between parallel hyperplanes, a massive field constrained by perpendicular hyperplanes, and a scalar field with a harmonic background potential.
This allows electrons in the bulk of the crystal to behave as though they were massless particles, effectively a bulk analogue of the atomically-thin material graphene.
According to [9], the <<Higgs>> mechanism for relativistic theories of the interaction of elementary particles is based on the idea that when a massless scalar particle <<contacts>> a massless carrier of interaction, a carrier particle with mass (some unknown massive boson) is born.