ostracoderm
paleontology
an archaic and informal term for a member of the group of armoured, jawless, fishlike (fish) vertebrates (vertebrate) that emerged during the early part of the Paleozoic Era (542–251 million years ago). Ostracoderms include both extinct (extinction) groups, such as the heterostracans and osteostracans, and living forms, such as hagfishes (hagfish) and lampreys (lamprey).- Port Gibson
- Port Harcourt
- Port Hawkesbury
- Porthcawl
- Port Hedland
- Port Hueneme
- Port Huron
- Portici
- portico
- Portion of the periodic table of elements related to semiconductors
- Port Jackson
- Port Kelang
- Portland
- portland cement
- Portland Inlet
- Portland, Isle of
- Portland State University
- Portland Vase
- Portland, William Henry Cavendish Bentinck, 3rd Duke of, Marquess Of Titchfield, Earl Of Portland, Viscount Woodstock, Baron Of Cirencester
- Portlaoise
- Port Lavaca
- Port Lincoln
- Port Louis
- Port Macquarie
- portmanteau word