flammable

The word 'flammable' is a modern construction, entering English in the early 19th century. It was formed by directly combining the Latin root flamm-, meaning "flame" or "to burn", with the common English adjectival suffix -able, which denotes a capacity or susceptibility. The logic is transparent: something that is "flammable" is "capable of being set aflame." Interestingly, the synonymous term 'inflammable' predates it and shares the same Latin root (in- here is an intensifier, not a negator), but due to potential confusion with the negative prefix in-, 'flammable' was promoted in safety labeling to ensure clear communication of fire hazard.

Structure: flamm (to burn) + able (capable of) flamm: From Latin flammāre (to set on fire), from flamma (flame). It functions as the core root conveying the concept of fire or burning. able: From Latin -ābilis, a suffix forming adjectives meaning "capable of, fit for, or tending to". It functions as a derivational suffix indicating a passive quality or susceptibility.