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pterygium
pterygoid process
pteryla
PTFE
ptg.
PTH
PTN
PTO
Ptolemaeus
Ptolemaic
Ptolemaic system
Ptolemaist
ptomaine
ptomaine poisoning
ptosis
pts.
PTSD
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Ptolemaeus

Ptol·e·mae·us [ tòllə máy əss ] large walled plain on the Moon that is noticeably hexagonal in shape and has a highly cratered floor. Located northeast of Mare Imbrium, it is approximately 140 km (85 mi) across.
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