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Tri- or tria- is a numerial prefix meaning 3 that can be either Greek or Latin; though occasionally tre- also exists for Latin. Examples are:- A trioxide has 3 oxygen atoms
- A tricycle is a children's vehicle with 3 wheels
- A trilogy is a series of 3 books
- The Triassic Period had 3 layers of rock.
- A triad has 3 musical notes.
Numerical prefixes
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