ISEE/SSAT Vocabulary BuilderWord partsPrefixesexo/ecto
PrefixGreek
exo/ecto
outside, external
Greek exo meant outside: an exoskeleton sits outside, an exoplanet circles another star, and exogenous forces come from beyond a system.
Words built from it
- exotic — originating from a foreign, unfamiliar place
exo- (outside) + -tic (relating to) - exoskeleton — a hard external supporting structure of an animal
exo- (outside) + skeleton (dried body) - exoplanet — a planet outside our solar system
exo- (outside) + planet - exogenous — originating from outside a system
exo- (outside) + gen (produced) - ectothermic — relying on external heat to regulate body temperature
ecto- (outside) + therm (heat)
Looks like it, but is not
- exorbitant — from Latin ex- 'out of' + orbita 'wheel track, orbit' — a Latin ex-, not the Greek exo- root here
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More prefixes
- eu — good, positive
- ex — out, away
- extra/extro — outside, beyond
- fore — before; in front
- geo — earth, ground