1. An ancient Roman unit of length (4.85 English feet) measured as the distance from the heel of one foot to the heel of the same foot when next it touches the ground

Type of: linear measure, linear unit

• family Pomatomidae
• family Pongidae
• family Pontederiaceae
• family Porcellionidae
• family Portulacaceae
• family Portunidae
• family Potamogalidae
• family Potamogetonaceae
• family practice
• family Priacanthidae
• family Primulaceae
• family Pristidae
• family Procaviidae
• family Procellariidae
• family Procyonidae
• family Proteaceae
• family Proteidae
• family Prunellidae
• family Pseudococcidae
• family Pseudomonodaceae
• family Psilophytaceae
• family Psilotaceae
• family Psittacidae
• family Psocidae
• family Psophiidae