Etymology
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Words related to -aceous

-acea 
word-forming element in Modern Latin making names for orders and classes in zoology (Crustacea, Cetacea, etc.), from Latin -acea, neuter plural of -aceus "belonging to, of the nature of" (enlarged from adjectival suffix -ax, genitive -acis).

The names are thus formally adjectives, Latin animalia "animals" (a neuter plural noun) being understood. Thus Crustacea "shellfish" are *crustacea animalia "crusty animals."

In botany, the suffix is -aceae, from the fem. plural of -aceus, forming orders or families of plants (Rosaceae, etc.) with a presumed plantae "plants," which is a fem. plural.
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carbonaceous (adj.)
1791, "pertaining to or consisting of charcoal or coal;" 1794, "pertaining to or consisting of carbon;" see carbon + -aceous.
ceraceous (adj.)

"waxy, having the texture or color of new wax," 1738, from Latin cera "wax" (see cere (n.)) + -aceous.

curvaceous (adj.)

1936, U.S. colloquial, from curve (n.) + facetious use of -aceous, the Modern Latin botanical suffix meaning "of a certain kind." First recorded reference is in "Screen Book" magazine, writing of Mae West.

drupaceous (adj.)

"resembling or relating to a drupe or drupes," 1773; see drupe + -aceous.

lardaceous (adj.)
"full of or resembling lard," 1799; see lard (n.) + -aceous.
pomaceous (adj.)

"consisting of or resembling pomace," 1706, from Vulgar Latin *poma "apple," originally plural of Latin pomus "fruit," later "apple" (see Pomona) + -aceous.

saponaceous (adj.)

"soapy, resembling soap," 1710, from Latin sapo, sapon (see soap (n.)) + -aceous. In mid-19c. jocular use for "slippery, unctuous" in figurative senses (1837). Related: Saponacity

stercoraceous (adj.)
"consisting of or pertaining to feces," 1731, from Latin stercus (genitive stercoris) "dung" (from metathesized form of PIE *skert-, extended form of root *sker- (4) "excrement, dung") + -aceous.