1. Possessing a symmetrical tail that extends beyond the end of the vertebral column (as in most bony fishes)

Antonym: heterocercal

• expressly
• expresso
• expressway
• expropriate
• expropriation
• expulse
• expulsion
• expulsive
• expunction
• expunge
• expunging
• expurgate
• expurgated
• expurgation
• Issachar
• issuable
• issuance
• issue
• issue forth
• issueless
• issuer
• issuing
• Issus
• Istanbul
• isthmian