| synchronic | (adjective) concerned with phenomena (especially language) at a particular period without considering historical antecedents | - |
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| (adjective) occurring or existing at the same time or having the same period or phase | Synonyms: synchronal, synchronous |
| (adjective) (of taxa) occurring in the same period of geological time | - |
| tectonic | (adjective) pertaining to the structure or movement of the earth's crust | - |
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| (adjective) of or pertaining to construction or architecture | Synonyms: architectonic |
| telephonic | (adjective) of or relating to telephony | - |
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| thermionic | (adjective) of or relating to or characteristic of thermions | - |
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| tonic | (adjective) (used of syllables) bearing the principle stress, usually accompanied by a change in pitch | Synonyms: accented |
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| (adjective) employing variations in pitch to distinguish meanings of otherwise similar words | Synonyms: tonal |
| (adjective) of or relating to or producing normal tone or tonus in muscles or tissue | - |
| (adjective) imparting vitality and energy | Synonyms: bracing, brisk, fresh, refreshful, refreshing |
| (adjective) relating to or being the keynote of a major or minor scale | - |
| (noun) a medicine that strengthens and invigorates | Synonyms: restorative |
| (noun) (music) the first note of a diatonic scale | Synonyms: keynote |
| (noun) a sweet drink containing carbonated water and flavoring | Synonyms: pop, soda, soda pop, soda water |
| (noun) lime- or lemon-flavored carbonated water containing quinine | Synonyms: quinine water, tonic water |
| transonic | (adjective) (of speed) having or caused by speed approximately equal to that of sound in air at sea level | Synonyms: sonic |
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| ultrasonic | (adjective) having frequencies above those of audible sound | Synonyms: supersonic |
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| vibrionic | (adjective) caused by bacteria of the genus Vibrio | - |
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