noun, feminine/laɡˈtosa/plural: lactosas
lactosa is feminine in Spanish.
lactose
“Los tipos de azúcar incluyen azúcar de frutas (fructosa), azúcar de mesa (sucrosa) y azúcar de leche (lactosa).” — Types of sugar include fruit sugar (fructose), table sugar (sucrose) and milk sugar (lactose).
Related: deslactosado
From Latin lactem + -osa. Doublet of lechoso.