— rarefactional , adj. — rarefactive /rair'euh fak"tiv/ , adj.
/rair'euh fak"sheuhn/ , n.
1. the act or process of rarefying.
2. the state of being rarefied.
[ 1595-1605; rarefaction- (s. of rarefactio ), equiv. to L rarefact ( us ) (ptp. of rarefacere; see RAREFY) + -ion- -ION ]