호수 바닥에 쌓이는 유기질이 풍부한 어두운 색의 퇴적물.
A dark, organic-rich sediment found at the bottom of dystrophic lakes, primarily composed of humic substances.
예문:
"The accumulation of dy in the lake bed indicates a high concentration of humic substances."
"Researchers analyzed the dy samples to understand the historical nutrient levels of the water body."