Meaning of -ACEOUS in English

-ACEOUS

■ suffix

1》 Botany forming adjectives from family names: ericaceous.

2》 chiefly Biology & Geology forming adjectives describing similarity: olivaceous.

Origin

from L. -aceus 'of the nature of' + -ous .

Concise Oxford English vocab.      Сжатый оксфордский словарь английского языка.