Definition of "manes"

this was the Ustrina or place of burning their bodies, or some sacrificing place unto the Manes

1658, Sir Thomas Browne, Urne-Burial, Penguin, published 2005, page 9

Still may the manès of thy children riseTo chase calm slumber from thy wearied eyes;Still may their voices on the haunted airIn fearful whispers tell thee to despair,

1819, Felicia Hemans, The Wife of Asdrubal, Tales and Historic Scenes, page 171

At this instant the trappings of his attire caught the glaring eye-balls of a dying yeoman, who exerted his wasting strength to sacrifice one more worthy victim to the manes of his countrymen.

1869, J[ames] Fenimore Cooper, “Moral Tales and Sketches § Battle of Bunker Hill”, in H. A. Cleveland, editor, Golden Sheaves Gathered from the Fields of Ancient and Modern Literature: A Miscellany of Choice Reading for the Entertainment of the Old and the Young in Hours that Are Lonely and Weary‎, Zeigler, McCurdy & Co., page 24