| AR | air-breathing arthropods characterized by simple eyes and four pairs of legs |
|---|---|
| AR | a large class of arthropods including spiders and ticks and scorpions and daddy longlegs |
| AR | (zoology) relating to or resembling a member of the class Arachnida |
| AR | air-breathing arthropods characterized by simple eyes and four pairs of legs |
| AR | the middle of the 3 meninges |
| AR | (zoology) relating to or resembling a member of the class Arachnida |
| AR | the middle of the 3 meninges |
| AR | a region of northeastern Spain |
| AR | French writer who generalized surrealism to literature (1897-1982) |
| AR | a mineral form of crystalline calcium carbonate |
| AR | a river in central Brazil that flows generally northward (with many falls) to join the Tocantins River |
| AR | a river in central Brazil that flows generally northward (with many falls) to join the Tocantins River |