Definition of -aceous in English:

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-aceous

Pronunciation: /ˈeɪʃəs/

suffix

1 Botany Forming adjectives from family names ending in -aceae (such as ericaceous from Ericaceae).
2chiefly Biology & Geology Forming adjectives describing similarity, especially in shape, texture, or colour: arenaceous olivaceous

Origin

From Latin -aceus 'of the nature of' + -ous.

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