Wormword

noun
A word, which when spoken inveigles its way into the mind of the speaker and manifests itself in his flesh.
Origin
Named for the parasitic manifestation caused by the word.
Source
Entry Taken from a Medical Encyclopedia

Frelk

noun informal
A person who is sexually attracted to spacers.
Origin
Abbreviation of ‘free-fall-sexual-displacement complex’.
Source
Aye, and Gomorrah…

Farfetch

verb
The intuitive perception of a moral entirety.
Source
The Left Hand of Darkness

Hilf

noun
Acronym of “high intelligence life form”.
Source
Planet of Exile

Emmish

adjective informal
Behaviour characteristic of an Emotional (as distinct from a Parental or a Rational).
Source
The Gods Themselves

Godshatter

noun
Fragments of a superintelligence melded with a human-level intellect.
Source
A Fire Upon the Deep

Ziphead

noun informal
A person who has been made into a cognitive computer.
Source
A Deepness in the Sky

Polythera

noun
A sentient oceanic life form covering the surface of the planet Solaris.
Origin
Polús (many), possibly in combination with thera (“of her”).
Source
Solaris

Splicer

noun
A person who has become murderously and irreversibly insane due to excessive genetic modification.
Source
Bioshock

Mentat

noun
A class of Imperial citizens trained for supreme accomplishments of logic; human computers.
Origin
Possibly abbreviated from ‘mental attainment’.
Source
Dune

Persuadertron

noun
A chemical weapon that renders the victim totally open to suggestion.
Source
Syndicate

Psychohistory

noun
A branch of mathematics dealing with the reactions of human conglomerates to fixed social and economic stimuli.
Source
Foundation