Definition of terraform verb from the Oxford Advanced Learner's Dictionary

 

terraform

 verb
verb
BrE BrE//ˈterəfɔːm//
 
; NAmE NAmE//ˈterəfɔːrm//
 
Verb Forms present simple I / you / we / they terraform
BrE BrE//ˈterəfɔːm//
 
; NAmE NAmE//ˈterəfɔːrm//
 
he / she / it terraforms
BrE BrE//ˈterəfɔːmz//
 
; NAmE NAmE//ˈterəfɔːrmz//
 
past simple terraformed
BrE BrE//ˈterəfɔːmd//
 
; NAmE NAmE//ˈterəfɔːrmd//
 
past participle terraformed
BrE BrE//ˈterəfɔːmd//
 
; NAmE NAmE//ˈterəfɔːrmd//
 
-ing form terraforming
BrE BrE//ˈterəfɔːmɪŋ//
 
; NAmE NAmE//ˈterəfɔːrmɪŋ//
 
 
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terraform something to make a planet more like Earth, so that people can live on it Word Origin 1940s: from Latin terra ‘earth’ + the verb form.
See the Oxford Advanced American Dictionary entry: terraform