adjective suffix
Etymology: Middle English, partly from Old French -ious, -ios, -ieus, -ieux, from Latin -iosus, from -i- (penultimate vowel in nouns such as religio religion, malitia malice, species species, appearance, spatium space) + -osus -ose, and partly from Latin -ius (final portion of the nominative singular masculine form of adjectives such as meritorius that brings in money)
: -ous
edac ious