-al; -ial, -eal

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

Located near or around the renal calix.
The point in the orbit of a heavenly body; especially, the moon, or of an artificial satellite at which it is nearest to the earth.
1. Surrounding the tracheae.
2. Situated around the trachea.
Pertaining to, relating to, or of the nature of, a phalanx or phalanges.
Of or pertaining to phosphorus; resembling phosphorus.
Preceding the establishment of milk flow; a term applied to the feeding of a newborn baby with carbohydrate-electrolyte solutions to reduce initial weight loss until breast feeding is fully established.
Existing or occurring before birth with reference to the fetus.
principal (s) (noun), principals (pl)
1. A chief or head.
2. The head or director of a school or; especially, in England, a college.
3. A person who takes a leading part in any activity, as a play; a chief actor or performer.
4. The first player of a division of instruments in an orchestra (except the leader of the first violins).
5. Something of primary or chief importance.

Learn how to distinguish between principal and principle.

A reference to or characterized by periodontitis or marginal periodontitis.

Periodontitis is a dental disorder that results from progression of gingivitis, involving inflammation and infection of the ligaments and bones that support the teeth.

regimental (adjective), more regimental, most regimental
Referring to or pertaining to a military formation varying in size from a battalion to a number of battalions: "The regimental commander left his regimental headquarters to check on his military unit."
Relating to, contained in, or according to sacred writings, especially the biblical scriptures.
2. Written or relating to writing.
septal (adejective), more septal, most septal
A reference to or relating to a partition or a dividing wall between two spaces or cavities .
1. Preferring to use the left foot, the left hand, and/or the left eye.
2. Relating to or located on the left side; especially, the left side of the body.