ˈrē](ˌ)ōˈgrand-, -aand-, -dē-, -di- sometimes ˈrī] or ]əˈ-\ noun
Usage: usually capitalized R&G
Etymology: from the Rio Grande, river in the southwestern United States
: a disease of lettuce of unknown cause first reported from the Rio Grande valley and causing the older leaves to become reddish especially on the tips while the younger central ones blanch and do not grow to normal size