From quasi- + monochromatic. <span class="searchmatch">quasimonochromatic</span> (not comparable) Almost, but not quite, monochromatic....
quasimolecular quasimolecule quasimomentum quasi-money quasimoney <span class="searchmatch">quasimonochromatic</span> quasimonoenergetic quasimonomorphic quasimonopolistic quasi-moon quasimunicipal...