A prefix meaning 'three,' used to form words like 'triangle' or 'tricycle.'
From Latin 'tres' meaning 'three,' this prefix has been productive in English since medieval times. It appears in thousands of English words borrowed from Latin and French.
The letters T-R-I appear in so many languages because Latin was so influential—you'll find it in Spanish 'tres,' French 'trois,' Italian 'tre,' German 'drei.' All descended from the same ancient Indo-European root!
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