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| ortho- |
prefix |
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| Definition: |
| |
1. correct; correction, straightening
  orthography
orthodontics
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2. straight, upright, vertical
orthotropous
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3. perpendicular
orthorhombic
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4. fully hydrated or hydroxylated
orthophosphate
|
| [Via French and Latin< Greek orthos "straight, right"] |
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