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O

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Obsidian
Silicon hardened like glass in a volcanic eruption.

Odeion
Small theater used for concerts and council meetings.

Offering
Something given to God to worship him. In the Old Testament, God's people offered food and animals to God. In the New Testament, Jesus offered himself as a sacrifice to God for us. Followers of Jesus serve God with their whole lives as an offering of praise to God.

Oholah
Nickname given by Ezekiel to the northern kingdom. It means "her tent" and probably refers to the Baal high places the northern kingdom built.

Oholibah
Nickname given by Ezekiel to the southern kingdom. It means "tent worshiper," a reference to the Baal worship of Judah.

Olive crusher
The stone basin used to crush olives into pulp. A donkey pushed on a horizontal beam, which in turn rolled a millstone that crushed into a pulp ripe olives placed in a large, round basin. An olive crusher was often placed in a cave, where the moderated temperature improved the efficiency of oil production.

Orchestra
Large circular space in Greek theater used for chorus and actors.