The House of Hades (The Heroes of Olympus #4)(145)

Athena the Greek goddess of wisdom. Roman form: Minerva

Athena Parthenos a giant statue of Athena, the most famous Greek statue of all time

augury a sign of something coming, an omen; the practice of divining the future

aurum gold; the name of one of Reyna’s two metallic greyhounds that can detect lies

Auster Roman god of the South Wind. Greek form: Notus

Bacchus the Roman god of wine and revelry. Greek form: Dionysus

ballista (ballistae, pl.) a Roman missile siege weapon that launched a large projectile at a distant target (see also scorpion ballista)

barracks the living quarters of Roman soldiers

Bellona a Roman goddess of war

Boreads Calais and Zethes, sons of Boreas, god of the North Wind

Boreas god of the North Wind. Roman form: Aquilo

braccae Latin for trousers

Bunker Nine a hidden workshop Leo discovered at Camp Half-Blood, filled with tools and weapons. It is at least two hundred years old and was used during the Demigod Civil War.

Cadmus a demigod whom Ares turned into a snake when Cadmus killed his dragon son

Calypso the goddess nymph of the mythical island of Ogygia; a daughter of the Titan Atlas. She detained the hero Odysseus for many years.

Camp Half-Blood the training ground for Greek demigods, located on Long Island, New York

Camp Jupiter the training ground for Roman demigods, located between the Oakland Hills and the Berkeley Hills, in California

catapult a military machine used to hurl objects

Celestial bronze a rare metal deadly to monsters

centaur a race of creatures that is half human, half horse

centurion an officer of the Roman army

Ceres the Roman goddess of agriculture. Greek form: Demeter

charmspeak a blessing bestowed by Aphrodite on her children that enables them to persuade others with their voice

chiton a Greek garment; a sleeveless piece of linen or wool secured at the shoulders by brooches and at the waist by a belt

Circe a Greek goddess of magic

Clytius a giant created by Gaea to absorb and defeat all of Hecate’s magic

Cocytus the River of Lamentation in Tartarus, made of pure misery

cohort one of ten divisions in a Roman legion; a group of soldiers

Colosseum an elliptical amphitheater in the center of Rome, Italy. Capable of seating fifty thousand spectators, the Colosseum was used for gladiatorial contests and public spectacles, such as mock sea battles, animal hunts, executions, reenactments of famous battles, and dramas.

cornucopia a large horn-shaped container overflowing with edibles or wealth in some form. The cornucopia was created when Heracles (Roman: Hercules) wrestled with the river god Achelous and wrenched off one of his horns.

Cupid Roman god of love. Greek form: Eros

Cyclops a member of a primordial race of giants (Cyclopes, pl.), each with a single eye in the middle of his or her forehead

Daedalus in Greek mythology, a skilled craftsman who created the Labyrinth on Crete in which the Minotaur (part man, part bull) was kept

Damasen giant son of Tartarus and Gaea; created to oppose Ares; condemned to Tartarus for slaying a drakon that was ravaging the land

Demeter the Greek goddess of agriculture; a daughter of the Titans Rhea and Kronos. Roman form: Ceres

denarius (denarii, pl.) the most common coin in the Roman currency system

Diocletian the last great pagan emperor, and the first to retire peacefully; a demigod (son of Jupiter). According to legend, his scepter could raise a ghost army.

Diomedes a principal Greek hero in the Trojan War

Dionysus the Greek god of wine and revelry; a son of Zeus. Roman form: Bacchus

Doors of Death the doorway to the House of Hades, located in Tartarus. The Doors have two sides—one in the mortal world and one in the Underworld.

drachma the silver coin of Ancient Greece

drakon a gigantic yellow and green serpent-like monster, with frills around its neck, reptilian eyes, and huge talons; it spits poison

dryads tree nymphs

Earthborn Gegenees in Greek; monsters that wear only a loincloth and have six arms

eidolons possessing spirits

Elysium the section of the Underworld where those who are blessed by the gods are sent to rest in eternal peace after death

empousa a vampire with fangs, claws, a bronze left leg, a donkey right leg, hair made of fire, and skin as white as bone. Empousai [pl.] have the ability to manipulate the Mist, change shape, and charmspeak in order to attract their mortal victims.

Epirus a region presently in northwestern Greece and southern Albania

Eris goddess of strife

Eros Greek god of love. Roman form: Cupid

faun a Roman forest god, part goat and part man. Greek form: satyr

Favonius Roman god of the West Wind. Greek form: Zephyros

Fields of Asphodel the section of the Underworld where people who lived neither a good nor a bad life are sent after death

Fields of Punishment the section of the Underworld where people who were evil during their lives are sent after death to face eternal punishment for their crimes

Furies Roman goddesses of vengeance; usually characterized as three sisters—Alecto, Tisiphone, and Megaera; the children of Gaia and Uranus. They reside in the Underworld, tormenting evildoers and sinners. Greek form: the Erinyes

Gaea the Greek earth goddess; mother of Titans, giants, Cyclopes, and other monsters. Roman form: Terra

Geras god of old age

Geryon a monster with three bodies that was slain by Heracles/Hercules