| AC | a genus of Xenicidae |
|---|---|
| AC | small green-and-bronze bird |
| AC | alternative names for the family comprising the New Zealand wrens |
| AC | phylum or class of elongated wormlike parasites that live in the intestines of vertebrates: spiny-headed worms |
| AC | any of various worms living parasitically in intestines of vertebrates having a retractile proboscis covered with many hooked spines |
| AC | mostly trailing cacti having nocturnal white flowers |
| AC | cactus of the southwestern United States and northern Mexico having edible juicy fruit |
| AC | cactus of the southwestern United States and northern Mexico having edible juicy fruit |
| AC | wahoos |
| AC | large fast-moving predacious food and game fish |
| AC | an abnormal red blood cell that has thorny projections of protoplasm |
| AC | the presence of acanthocytes in the blood stream (as in abetalipoproteinemia) |