Capable of being gilded or covered with gold or gold-colored coating.
From gild + -able (capable of being). The -able suffix attaches directly to verb stems to create adjectives meaning 'able to be' or 'worthy of being' the verb action.
The -able suffix is incredibly productive in English—almost any verb can become '-able,' but only the ones that actually make sense survive in common use. You can technically say 'gildable' but you rarely need to, which shows how English allows infinite potential while filtering down to practical reality.
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