The most crispy; superlative form of crisp.
From 'crisp' plus superlative suffix '-est,' the oldest way English marks the highest degree of a quality. Compare 'crisp → crisper → crispest' to 'cold → colder → coldest.'
The '-est' ending is so ancient that we rarely add it to longer words anymore—we'd say 'most delicious' instead of 'deliciousest'—showing how English gradually prefers compound forms for longer adjectives.
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