| Word | Definitions | Synonyms |
|---|---|---|
| frigorific | (adjective) causing cold; cooling or chilling | - |
| perigonal | (adjective) of or relating to a perigone | - |
| rigorous | (adjective) demanding strict attention to rules and procedures | Synonyms: stringent, tight |
| (adjective) rigidly accurate; allowing no deviation from a standard | Synonyms: strict | |
| trigonal | (adjective) having threefold symmetry | Synonyms: rhombohedral |
| trigonometric | (adjective) of or relating to or according to the principles of trigonometry | - |