Webster’s Revised Unabridged Dictionary · 1913
Ichthus
Ich′thus (ĭk′thŭs), n. [Gr. ἰχθύς.] In early Christian and eccesiastical art, an emblematic fish, or the Greek word for fish, which combined the initials of the Greek words Ιησοῦς, Χριστός, Θεοῦ Γιός Σωτήρ, Jesus, Christ, Son of God, Savior.