fontanelle or fontanel /fon-tə-nelˈ/

1. A membrane-covered gap between the immature parietal bones in the skull of a fetus or infant
2. An opening for discharge (medicine)

• sufficiently
• sufficients
• sufficing
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• suffigance
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• suffisance
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• suffix
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• suffixed
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• sufflate
• sufflated
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• sufflation
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• suffocate