1. As the hard flattened scales of e.g. sharks
   - placoid

See also: planar, two-dimensional

• syllable
• syllable structure
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• syllepsis
• syllogise
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• sylph
• nonmalignant tumor
• nonmalignant tumour
• nonmandatory
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• nonmeaningful
• nonmechanical
• nonmechanistic
• nonmedicinal
• nonmember
• nonmetal