'mite-promoting' is a compound word formed from 'mite' and 'promoting'. 'Mite' originates from Old English 'mīte', meaning a small insect, and 'promoting' comes from Latin 'promovere', meaning to move forward or advance.

The term 'mite' has been used since Old English times to describe small insects, while 'promoting' evolved from Latin through Old French 'promouvoir'.

Initially, 'mite' referred to any small insect, but in modern usage, it specifically refers to arachnids. 'Promoting' has retained its meaning of encouraging or advancing.