1. Having no ribs or no visible ribs

Antonym: ribbed

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• hyperthermal
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• hyperthyroidism
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• hypertonic
• hypertonicity
• hypertonus
• hypertrophic cardiomyopathy
• hypertrophic rosacea
• hypertrophied
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• hypervitaminosis
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• hypesthesia
• hypethral
• hypha