The word "催乳" is formed by combining the character "催", meaning to urge or stimulate, constructed from the radical "人" (person) indicating human action and the phonetic component "崔" for pronunciation, with the character "乳", meaning milk or lactation, which originates as a pictograph depicting a nursing mother. Together, they create a compound that literally denotes the promotion of milk production, specifically referring to inducing or enhancing lactation.