Learn how to say Manumitter correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word manumit:
verb (manumits, manumitting, manumitted)
[with object] historical
release from slavery; set free:
old Angus had never manumitted a single slave
late Middle English: from Latin manumittere, literally ‘send forth from the hand’, from manus ‘hand’ + mittere ‘send’