Webster’s Revised Unabridged Dictionary · 1913
Hidalgo
Hi·dal′go (hĭ·dăl′gō; Sp. ̇·däl′gō), n. [Sp., contr. fr. hijo de algo, i. e., son of something; hijo son (fr. LL. filius) + algo something, fr. L. aliquod. Cf. Fidalgo.] A title, denoting a Spanish nobleman of the lower class.