noun, used as a prefix, noun
Used as a prefix or noun to describe something served cold, especially food and drinks. Common in compounds like 冷やし中華 (chilled ramen) or 冷やしトマト (chilled tomatoes).
夏は冷やし中華が食べたくなる。
In summer, I crave chilled ramen.
冷やしトマトはさっぱりしていて美味しい。
Chilled tomatoes are refreshing and delicious.
冷やす is the transitive verb 'to cool/chill something', from which 冷やし is derived as the continuative form used nominally.
The continuative form (連用形) of the verb 冷やす (to chill), used as a noun or prefix.