麦芽 (mài yá) literally means 'wheat sprout'—'麦' (mài) refers to wheat or cereal grains broadly, and '芽' (yá) means 'sprout' or 'bud'. In practice, it denotes malt: grain (usually barley, but sometimes wheat or rice) that has been soaked, germinated, and dried to activate enzymes that convert starch into fermentable sugars. This process is essential in brewing beer, making traditional Chinese malt sugar (maltose syrup), and producing certain health tonics or digestive aids.

Though the characters suggest a botanical stage, 麦芽 is almost always used as a technical food ingredient rather than a general botanical term. It appears in food labels, traditional medicine contexts, and cooking instructions—especially for sweets, fermented drinks, and infant formulas. Unlike generic terms like 'sprout', 麦芽 specifically implies controlled germination for functional (enzymatic or sweetening) purposes, not just young plant growth.