Question: what does worsted mean in knitting?
Answer: Weight. According to the Craft Yarn Council, the term "Worsted Weight", also known as "Afghan", "Aran", or simply "Medium", refers to a particular weight of yarn that produces a gauge of 16–20 stitches per 4 inches of stockinette, and is best knitted with 4.5mm to 5.5mm needles (US size 7–9).