| adiabatic | (adjective) occurring without loss or gain of heat | - |
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| arcadian | (adjective) (used with regard to idealized country life) idyllically rustic | Synonyms: bucolic, pastoral |
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| biradial | (adjective) showing both bilateral and radial symmetry | - |
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| circadian | (adjective) of or relating to biological processes occurring at 24-hour intervals | - |
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| gladiatorial | (adjective) of or relating to or resembling gladiators or their combat | - |
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| radial | (adjective) relating to or moving along or having the direction of a radius | - |
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| (adjective) relating to or near the radius | - |
| (adjective) issuing in rays from a common center; relating to rays of light | - |
| (adjective) arranged like rays or radii; radiating from a common center | Synonyms: radiate, stellate |
| radiant | (adjective) radiating or as if radiating light | Synonyms: beaming, beamy, effulgent, refulgent |
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| radiate | (adjective) having rays or ray-like parts as in the flower heads of daisies | - |
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| (adjective) arranged like rays or radii; radiating from a common center | Synonyms: radial, stellate |
| radiating | (adjective) diverging from a common point | - |
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