| adder | small terrestrial viper common in northern Eurasia |
|---|---|
| adder | a machine or person that adds |
| adder | mat-forming lithophytic or terrestrial fern with creeping rootstocks and large pinnatifid fronds found throughout North America and Europe and Africa and east Asia |
| adder | ferns with fertile spikes shaped like a snake's tongue |
| adder | ferns with fertile spikes shaped like a snake's tongue |