(1) of or relating to apples
(2) resembling a pome
The back porch held a sweet, pomaceous aroma, and immediately Glen knew that his mother had baked an apple pie for dessert.
"This Festival is devoted to the mysteries of Plant Reproduction, especially that of those wondrous trees, the Angiosperms, with special emphasis upon the Drupes and the Pomaceous Fruits." — From Margaret Atwood's 2009 novel The Year of the Flood
MW's "Did you know?" section:
"Pomaceous" was first planted in the English language by physician Edward Baynard when, in 1706, he advised, "Apples and pomaceous Juices, are the greatest Pectorals." ("Pectoral" is now a rarely used word for a food that helps digestion.) Since then, "pomaceous" has mainly been sown by botanists and poets. The word, which is ultimately derived from Late Latin "pomum" (meaning "apple"), was originally used of apples and things relating to apples, but later it was also applied to things that look like pears. (Pears, like apples, belong to the pome family.)