-al; -ial, -eal

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

acronical
Happening at sunset or in the evening, as the rising of a star.
acronych
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).
acropetal
1. Developing upward from the base toward the apex or tip.
2. Rising toward the summit.
acrostichal
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
Of or pertaining to the Actinozoa.
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
Pertaining to or having projecting ribs.
acutilingual (adjective)
Having a sharply pointed tongue or mouth; such as, certain bees.
adaxial
Nearest to or facing toward the axis of an organ or organism: "The upper side of a leaf is known as the adaxial surface."

Abaxial describes a plant part which is on the side or surface of an organ, facing away from the axis.

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