-aceous, -acea, -aceae, -aceaen, -aceus

(Latin: a suffix; having the quality of, of the nature of, characterized by, belonging to, resembling)

There are hunderds of words that utilize the -aceous suffix which are not shown here; however, the following will present important examples.

A suffix that forms adjectives and is used with technical combinations, especially in biological terms: "pertaining or belonging to, of the nature of, or characterized by; to be full of, to possess abundantly". The suffix -acea usually denotes "orders and classes in zoology" while the suffix -aceae usually denotes "orders and families in botany" and -aceaen is used to denote members of "orders of the animal kingdom".

terraceous
Earthen or of the earth.
Tylostomaceae
ulotrichaceous
A reference to a family of green algae.
vinaceous (adjective), more vinaceous, most vinaceous
Relating to the reddish color of wine; wine-colored.
Vitaceae, vitaceae
1. A family of dicotyledonous plants in the order Rhamnales (two seed lobes); mostly tendril-bearing climbers with compound or lobed leaves, as in grapes.
2. A taxonomic family within the order Vitales — many vines, including grape and Virginia creeper.
zygnemaceous
zygophyllaceous
Flowering plants that have pinnate leaves (a central stem with parts branching off it like feathers) and capsules as fruits.

Also see this closely related -eous suffix unit.