| an ancient tool used to perform calculations |
abacus |
| a cooperative relationship between species |
atrophy |
| a very small flightless parasitic insect |
detritus |
| crumbling, discarded material; debris |
louse |
| a long angry speech; a condemnation |
peril |
| a reduction in a body organ due to disease, injury, or lack of use |
regalia |
| the symbols, objects, or special costumes worn by a group |
symbiosis |
| imminent danger; exposure to the risk of harm or loss |
tirade |
