-ac

(Greek > Latin: suffix; from French -aque, or directly from Latin -acus, from Greek -akos forming adjectives. This suffix was used to form names of arts and sciences in Greek and it is now generally used to form new names of sciences in English; meanings, "related to, of the nature of, pertaining to, referring to")

The suffix -ic has related elements.

ambrosiac
The food of the gods, thought to confer immortality; now, a dessert consisting primarily of oranges and flaked coconut.
ammoniac
amnesiac
1. Someone who is afflicted with amnesia.
2. Partial or total loss of memory.
anaphrodisiac (adjective), more anaphrodisiac, most anaphrodisiac
Relating to something which decreases sexual desires: In order to safely transport the stallion with the other horses, John, the veterinarian, gave him an anaphrodisiac injection.
anthomaniac
Someone who has an abnormal passion for flowers or who is intensely fond of flowers.
antidemoniac
1. Opposed to demons.
2. Anything effective against evil spirits.
aphorodisiac
cardiac
Near or relating to the heart.
celiac
coeliac
demoniac
Believed to be possessed by a demon, devil, or evil spirit; insane.
elegiac
haemophiliac
heliac
hemophiliac