| AP | having no placenta |
|---|---|
| AP | an order of Amphineura |
| AP | deep-water wormlike mollusks lacking calcareous plates on the body but having fine slimy spicules on the covering mantle |
| AP | (optics) free from or corrected for spherical aberration |
| AP | failure of some tissue or organ to develop |
| AP | anemia characterized by pancytopenia resulting from failure of the bone marrow |
| AP | anemia characterized by pancytopenia resulting from failure of the bone marrow |
| AP | a monocotyledonous genus of the family Orchidaceae |
| AP | North American orchid bearing a single leaf and yellowish-brown flowers |
| AP | light-colored and fine-grained granitic rock consisting chiefly of quartz and feldspars |
| AP | of or related to aplite |
| AP | type genus of the Aplodontiidae: comprising the mountain beavers |