(archaic, heraldry, now offensive) A person with dark black skin, especially one from north Africa.
Argent, three blackamoors’ heads couped sable, capped or, fretty gules.
Gage noted the clothing of the slaves of the Spanish nobles, and silk was common to them. "The gentlemen have their train of blackamoor slaves, some a dozen, some half a dozen, waiting on them, in brave and gallant liveries, heavy with gold and silver lace, with silk stockings on their black legs, and roses on their feet, and swords by their sides."
(now offensive) A black slave or servant, and hence any slave, servant, inferior, or child.
1893, Annotation to The Diary of Samuel Pepys by "Mary", http://www.pepysdiary.com/archive/1660/08/10/index.php citing Restoration London, Liza Picard, pages 178-179.
In 1596 Elizabeth I had already decreed that all "blackamoors" should be sent back to Spain or Portugal as they were disturbing local labour markets. It became very fashionable for the wealthy to have "blackamoor" page boys and personal servants, as their complexions set off the pale-skinned beauty of the women of the family.