Living in trees; arboreous: arboreal apes. (adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "arboreal" in a sentence
"It's actually arboreal, which is quite extraordinary when you think about it."
"Specialist organisms such as arboreal lichens, wood-rotting fungi, and mosses and invertebrates have declined with the decrease in large old trees, snags, and logs."
"As opposed to, say, spiders or scorpions I guess you don't need binocular vision to pick those up... or some kind of arboreal predator like huge birds of prey or big cats."