Capable of being drained; able to have liquid removed or emptied out.
From 'drain' (to empty liquid) + '-able' (suffix meaning 'capable of' or 'possible to'). Follows the standard English word formation pattern for creating adjectives describing potential actions.
The word 'drainable' became technically important in engineering and agriculture, where it distinguishes soil types and water management potential. A farmer assessing land asks a simple question—is this drainable?—that determines whether it's usable for crops.
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