Ansible

noun
A device that allows instantaneous communication over any distance.
Origin
Contraction of ‘answerable’.
Source
Rocannon’s World

Necrosphere

noun
An airborne swarm of self-organising inanimate matter.
Origin
Nekrós (the dead).
Source
The Invincible

Cosmeg

noun
A single star containing all the mass in the universe.
Origin
Abbreviated from ‘cosmic egg’.
Source
The Gods Themselves

Emmish

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

Batcar

noun
A battery-powered vehicle.
Source
The Lathe of Heaven

Godshatter

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

Agrav

noun
A material producing an anti-gravity effect.
Source
A Fire Upon the Deep

Manhome

noun proper
The Earth.
Source
Norstrilia

Hier

verb
To perceive the thoughts of others telepathically.
Origin
Corruption of ‘hear’.
Source
Norstrilia

Oophase

adjective
Of a child: born after the waning years of the On-Off sun.
Origin
Abbreviation of ‘out of phase’.
Source
A Deepness in the Sky

Tream

noun
A virtual reality scenario experienced via direct interface with the brain.
Origin
Portmanteau of ‘transmit’ and ‘dream’.
Source
The Algebraist

Ziphead

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