isoflux adjective 1noun 1forms 1 adjective1 •Pertaining to a uniform level of flux.The rms of thermal fluctuations at the wall were zero for the isothermal condition and nonzero for the isoflux condition. — 2008 noun1 •The product obtained by multiplying the flux measurement by the isotopic signature.It is even more difficult when one considers that the disequilibrium is spatially variable so that the global isoflux must be properly flux-weighted for the effect of different regions. — 2001 formsisofluxes