Resembling, containing, or having the characteristics of cress, especially its peppery or pungent flavor.
From cress (the plant) plus the suffix -y (meaning 'having the quality of'), following standard English adjective formation.
Foods described as 'cressy' have that distinctive peppery bite that comes from sulfur compounds in the plant—the same compounds that make your nose tingle and give cress its kick!
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