Plural of stomach: the organ that digests food, or the ability to tolerate something difficult (like 'I can't stomach that behavior').
From Greek 'stomachos' meaning 'mouth' or 'throat,' derived from 'stoma' meaning 'opening.' Over time, the word narrowed to refer specifically to the digestive organ just below the mouth opening.
Your stomach produces a new lining every 3-5 days because the acid that digests your food would otherwise digest the stomach itself—this is why the stomach can truly be said to 'stomach' things, protecting itself through constant renewal while dealing with whatever you throw at it.
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