-al; -ial, -eal

(Latin: suffix; pertaining to, like, of the kind of, relating to, characterized by, belonging to; action of, process of)

arachnidial (adjective) (not comparable)
Pertaining to the Arachnida: The arachnidial creatures that were crawling along on the sand were scorpions, and so Jane thought it best to avoid them!
arachnoideal (adjective) (not comparable)
An unnecessary variant of "arachnoid", or having the appearance or texture of a spider's web: The drawing of one of the meninges in Jane's biology book was a good representation of an arachnoideal membrane which envelops the brain and spinal cord.
arboreal (adjective), more arboreal, most arboreal
1. Relating to or resembling a tree or trees: The arboreal cover in the park provided lots of shade for the picnickers.
2. Living in trees; such as, birds or animals: There are arboreal apes, gibbons, and squirrels among other arboreal creatures.
3. Adapted for life in trees: Sam and Mary discovered a variety of arboreal birds which were living in the trees down by the river.
Pertaining to trees or inhabiting trees like arboreal animals or birds.
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Relating to or like a tree.
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Pertaining to or similar to a tree or trees.
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Referring to arctic lands; such as, the arctogeal fauna (animals).
arthrodial (adjective), more arthrodial, most arthrodial
Descriptive of joints; such as, those in the spinal column which articulate between semi-flat surfaces: A common complaint among some gym users is that they have aching arthodial areas in their backs.
artificial (adjective)
1. Made by human skill; produced by humans; as, opposed to natural origins; such as, artificial flowers.
2. Imitation; simulated; sham: "Barbara used artificial vanilla flavoring when baking her cake."
3. Lacking naturalness or spontaneity; forced; contrived; feigned: "Sally greeted us with an artificial smile."
4. Full of affectation; affected; stilted; for example, artificial manners, artificial speech.
5. Made without regard to the particular needs of a situation, person, etc.; imposed arbitrarily; unnatural: "Jack thought the club presented artificial rules for membership."
6. Based on arbitrary, superficial characteristics rather than natural, organic relationships: "The botanists presented an artificial system of classification for the plants."
7. Manufactured to resemble a natural gem in jewelry, with chemical composition, and appearance.
Certain specialized, or abnormal, floral and foliage leaves.