1. In essence; at bottom or by one's (or its) very nature
   - basically, essentially

See also: fundamental

• family Cunoniaceae
• family Cupressaceae
• family Curculionidae
• family Cuterebridae
• family Cyatheaceae
• family Cycadaceae
• family Cyclopteridae
• family Cymatiidae
• family Cynipidae
• family Cynocephalidae
• family Cynoglossidae
• family Cyperaceae
• family Cypraeidae
• family Cyprinidae
• family Cyprinodontidae
• family Cyrilliaceae
• family Dacninae
• family Dacrymycetaceae
• family Dactylopiidae
• family Dactylopteridae
• family Dactyloscopidae
• family Danaidae
• family Dasyatidae
• family Dasypodidae
• family Dasyproctidae