Resembling or containing grill marks; having a striped or lined appearance like something cooked on a grill.
From 'grill' (food cooking device or the marks it leaves) plus the adjectival suffix '-y,' meaning 'having the quality of' or 'resembling.'
The word 'grilly' shows how English adds '-y' to almost any noun to make adjectives—like 'milk' becomes 'milky' and 'rain' becomes 'rainy'—it's one of the most productive word-making patterns in English.
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