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subfamily
subfield
subfloor
subflooring
subfossil
subframe
subfusc
subgenus
subgrade
subgroup
subgum
subhead
subhuman
subimago
subinfeudation
subirrigate
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subgrade
sub·grade [ súb gràyd ] (plural sub·grades)


noun 
Definition:
 
surfaced ground for construction: the bed of ground on which the foundations of a road, railroad, or building are laid
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