| 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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| radical | (adjective) especially of leaves; located at the base of a plant or stem; especially arising directly from the root or rootstock or a root-like stem | Synonyms: basal |
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| (adjective) of or relating to or constituting a linguistic root | - |
| (adjective) arising from or going to the root or source | - |
| (adjective) (used of opinions and actions) far beyond the norm | Synonyms: extremist, ultra |
| (adjective) markedly new or introducing radical change | Synonyms: revolutionary |
| radio | (adjective) indicating radiation or radioactivity | - |
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| radioactive | (adjective) exhibiting or caused by radioactivity | - |
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| radiographic | (adjective) relating to or produced by radiography | - |
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| radiological | (adjective) of or relating to radiology | - |
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| radiolucent | (adjective) almost complete transparent to X-rays or other forms of radiation | - |
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| radiopaque | (adjective) not transparent to X-rays or other forms of radiation | Synonyms: radio-opaque |
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| radiophonic | (adjective) relating to or by means of radiotelephony | Synonyms: radiotelephonic |
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| radiosensitive | (adjective) sensitive to radiation | - |
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| radiotelephonic | (adjective) relating to or by means of radiotelephony | Synonyms: radiophonic |
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