-ical

(Latin: from -icalis, a suffix that forms adjectives from nouns; of or having to do with; having the nature of; constituting or being; containing or made up of; made by or caused by; like, characteristic of; art or system of thought; chemical terms)

arachnological
Referring to, or pertaining to, arachnology.
arborical
Relating to or formed by trees.
archetypical
Representing or constituting an original type after which other similar things are patterned.
archetypical
Representing or constituting an original type after which other similar things are patterned.
aristocratical
aromatical (adjective)
Pertaining to, or containing, aroma; fragrant; spicy; strong-scented; having an agreeable odor; odoriferous; such as, aromatic balsam.
artistical (adjective)
1. Pertaining to art or to artists.
2. Something made in the manner of an artist.
3. Conformable to art.
4. Characterized by art.
5. Showing taste or skill.
aspherical (adjective), more aspherical, most aspherical
With reference to a reflecting surface or lens, deviating slightly from a perfectly round shape and relatively free from aberrations: "In photography, a lens assembly that includes an aspheric element is often called an aspherical lens."

"As a joke, Lance described his cat as aspherical; that is, not quite round but very plump."

asteroidical
Relating to a star-shaped object or objects.
astrological
Relating to or concerned with astrology; such as, astrological learning or astrological prognostication.
astrometeorological
A reference to the study of the theoretical effects of astronomical bodies and forces on the earth's atmosphere.
astronautical (adjective) (not comparable)
A reference to traveling in outer space or the science and technology of space flight.
astronomical
1. Relating to the science of astronomy.
2. Extremely large: "The cost of this house was astronomical!"
astrophysical
1. Relating to or used in astrophysics.
2. Relating to stellar physics, or the study of the physical structure of the stars.
asymmetrical (adjective), more asymmetrical, most asymmetrical
1. Pertaining to something that is not balanced or regularly arranged on opposite sides of a line or around a central point.
2. A reference to something that is lacking equality, balance, or harmony and so not having the same shape and size on both sides.
3. In chemistry, a reference to a carbon atom which has four different atoms or structural groups attached to it, resulting in an unbalanced spatial arrangement of atoms in a molecule, so that the molecule cannot be superimposed on its mirror image.
4. In electrical engineering, relating to varying conductivity or a description of a substance or a device that exhibits varying or different conductivities for electric currents flowing through it in different directions.
5. Referring to an aircraft which is unbalanced because of an unequal thrust from two or more sources; such as, when one engine of a pair is not functioning properly.