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English thesaurus
Planetary Defense Systems
mil., abbr.	PDS
Planetary Defense System
abbr., astronaut., mil.	PDF; PDS (Air Force 2025 concept)

Planetary : 78 phrases in 19 subjects

Astronomy	5
Automobiles	3
Chemistry	7
Cultural studies	1
Earth sciences	2
Education	2
Electronics	4
Environment	2
Forestry	1
Industry	1
Life sciences	6
Mechanic engineering	30
Metallurgy	1
Meteorology	1
Natural sciences	4
Politics	1
Social science	1
Technology	4
Transport	2