nona

noun Pathology.

1. sleeping sickness(def 2).

noun Pathology.

1. a disease of the liver that is clinically indistinguishable from hepatitis B but is caused by a retrovirus or retroviruslike agent.

1. a combining form meaning “nine, ninth,” used in the formation of compound words: nonagon.

combining form

1. ninenonagon

before vowels non-, word-forming element from comb. form of Latin nonus “ninth” (see nones).