" 'MULATTO' IS NOT A COOL WORD"
ETYMOLOGY (noun) - the study of the origin of words and the way in which their meanings have changed throughout history. [Definition from google]
ETYMOLOGY OF THE WORD "MULE" - 1590s, "offspring of a European and a black African," from Spanish or Portuguese mulato "of mixed breed," literally "young mule," from mulo "mule," from Latin mulus (fem. mula) "mule" (see mule (n.1)); possibly in reference to hybrid origin of mules (compare Greek hemi-onos "a mule," literally "a half-ass;" as an adjective, "one of mixed race"). As an adjective from 1670s. Fem. mulatta is attested from 1620s; mulattress from 1805.