1. Slender aspen native to North America
   - American aspen, Populus tremuloides

Type of: aspen

• pyriform area
• pyriform lobe
• pyrilamine
• pyrimidine
• pyrite
• pyrites
• pyro-
• pyrocellulose
• Pyrocephalus
• Pyrocephalus rubinus mexicanus
• pyrochemical
• pyrochemical process
• pyrochemistry
• pyroclastic
• pyroelectric
• pyroelectrical
• pyroelectricity
• pyrogallic
• pyrogallic acid
• pyrogallol
• pyrogen
• pyrogenetic
• pyrogenic
• pyrogenous
• pyrograph