The Chinese word **马驹 (mǎjū)**, meaning "foal" or "colt," is formed through a straightforward and common compound word structure in Mandarin. It combines the generic noun **马 (mǎ)**, meaning "horse," with the more specific noun **驹 (jū)**, which intrinsically means "young horse" or "foal." This creates a **modifier-head** or **appositive** compound, where the first element **马** specifies and clarifies the category of the second element **驹**, effectively reinforcing and narrowing the meaning to "a young one *of the horse type*." This pattern is analogous to English compounds like "oak tree," where "oak" specifies the type of "tree," and is frequently used in Chinese for naming young animals, such as 牛犊 (niúdú, calf) and 羊羔 (yánggāo, lamb).