1. plural of mastiff; large, powerful dogs with broad heads and strong builds, originally bred for guarding and protection

Examples

• The two mastiffs stood guard at the estate’s entrance.
• English mastiffs are known for their gentle temperament despite their imposing size.
• The kennel specialized in breeding mastiffs and other large working dogs.
• Ancient Romans used mastiffs in warfare and as gladiator dogs.
• The mastiffs weighed over 200 pounds each.
• She trained mastiffs for personal protection services.