| A | B | 
| anachronism | something out of place or time | 
| geochronology | study of the ages of geologic events | 
| synchronous | occurring at the same time | 
| chronothermal | relating to both time and temperature | 
| chronic | continuing a long time or recurring frequently | 
| chronology | science of determining the order in which things occur | 
| chronometer | timekeeping device of great accuracy, especially in measuring longitude | 
| optometry | testing of the eyes to measure vision | 
| synoptic | taking a general view of the whole subject | 
| optical | pertaining to the eye;vision | 
| optophone | device used by the visually impaired to convert written text into sounds | 
| biopsy | removal and examination of tissue from a living body | 
| biometric | related to the statistical analysis of biological observations and phenomena | 
| biogenic | produced by the action of living organisms | 
| annihilate | to destroy or wipe out | 
| expendable | worth sacrificing to gain an objective | 
| teeming | swarming | 
| paradox | something that seems to contradict | 
| resilient | able to recover quickly | 
| remit | give back payment | 
| undulate | move in waves | 
| revoke | cancel;withdraw | 
| deplorable | very bad | 
| precariously | in an unsteady manner |