trop·ic·bird 
(trŏpĭk-bûrd′)
(trŏpĭk-bûrd′)n.
Any of several predominantly white, swift-flying seabirds of the genus Phaethon of warm regions, having a pair of very long central tail feathers.
- protolithic
- protomartyr
- protomorph
- protomorphic
- proton
- protonema
- protonemal
- protonematal
- protonic
- protonotary
- protonotary
- protonotary apostolic
- proton-proton chain
- proton pump inhibitor
- proton synchrotron
- proto-oncogene
- protopathic
- protopathy
- protoplanet
- protoplanetary disk
- protoplasm
- protoplasmal
- protoplasmatic
- protoplasmic
- protoplast