DISSERTATIONIST
Dis`ser*ta"tion*ist, n.

Defn: A writer of dissertations.

DISSERTATOR
Dis"ser*ta`tor, n. Etym: [L.: cf. F. dissertateur.]

Defn: One who writers a dissertation; one who discourses. Boyle.

DISSERTLY
Dis*sert"ly, adv.

Defn: See Disertly. [Obs.]

DISSERVE
Dis*serve", v. t. [imp. & p. p. Di; p. pr. & vb. n. Disserving.]
Etym: [Pref. dis- + serve: cf. F. desservir.]

Defn: To fail to serve; to do injury or mischief to; to damage; to
hurt; to harm.
Have neither served nor disserved the interests of any party. Jer.
Taylor.

DISSERVICE
Dis*serv"ice, n. Etym: [Pref. dis- + service: cf. F. desservice.]

Defn: Injury; mischief. We shall rather perform good offices unto truth than any disservice unto their relators. Sir T. Browne.