say it: SMOH-kluhs
smokeless is an adjective meaning "emitting or containing little or no smoke". It carries one recorded sense.
emitting or containing little or no smoke
“smokeless factory stacks”
“smokeless fuel”
“a smokeless environment”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for smokeless come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.