The crossword solution for the term 'AID IN WEED CONTROL' is 'HOE', which is a three-letter word. A HOE is a tool used to remove weeds from soil, and is commonly used in gardening and farming. It is also used to break up soil and create furrows for planting. Hoes are usually made of metal or wood, and have a long handle with a flat blade at the end. Hoes are an effective aid in weed control, as they can be used to quickly and easily remove weeds from the soil.