-al; -ial, -eal

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

Happening at sunset or in the evening, as the rising of a star.
Happening in the evening or at night-fall, vespertine, as the acronychal rising or setting of a star. Sometimes this term is used as if “rising in the evening or at sunset and setting at sunrise”; but this is not correct. When the rising is acronychal, the setting is cosmical, and vice versa. (According to the Oxford English Dictionary).
1. Developing upward from the base toward the apex or tip.
2. Rising toward the summit.
Situated in the highest rank or row; referring to certain bristles on the mesonotum of muscoid flies.
actinal (adjective)
The region from which the rays or tentacles grow on a radiate animal.
actinozoal (adjective) (not comparable)
In zoology, pertaining to the Actinozoa: Jack wanted to find out more information about actinozoal lifeforms in the sea, including hydras, polyps, jellyfishes, and corals, for his term paper.
actual (adjective) (no comparatives)
1. Existing and not merely potential or possible.
2. Being, existing, or acting at the present moment; current.
3. Based on fact: "She presented an actual account of the accident just as it happened."
actual cautery
A procedure in which a very hot iron is used as the cauterizing agent.
acuticostal (adjective), more acuticostal, most acuticostal
Pertaining to or having projecting ribs: After having lost so much weight, Anita thought that she had acuticostal bones that extended from the spine towards the backbone because she could definitely see them, so she tried gaining more weight again.
acutilingual (adjective), more acutilingual, most acutilingual
Referring to animals that have a sharply pointed tongue or mouth: In zoology, it is stated that certain bees are acutilingual.
adaxial (adjective) (not comparable)
Descriptive of that which is nearest to or facing toward the axis of an organ or organism: The top part of a leaf is known as the adaxial side or surface.

Abaxial describes a plant part which is on the side of an plant and faces toward the the axis.

Obsolete term relating to a gland and a nervous element.
adipal (adjective)
Fat, greasy.
adipodermal graft
Skin-fat graft.
adjectival (ajective)