chrono-, chron-

(Greek: time, times; sequence of times)

A relatively short-lived fossil flora or fauna.
1. In geology, the study of the age of the earth based on the relative dating of rocks and geologic events by the use of fossil evidence.
2. The dating of biological events using biostratigraphic or paleontological methods.
The study of the deleterious effects of time on a living system.
The shortest interval into which geologic time is subdivided.

To keep better time is not to know time better. Time’s mystery is not lessened by ever better clocks—it is brought only more clearly into focus.

—James Jesperson, Physicist,
National Institute for Standards and Technology
Of or relating to time.
chronaxie, chronaxia, chronaxis, chronaxy
1. A measurement of excitability of nervous or muscular tissue; the shortest duration of an effective electrical stimulus having a strength equal to twice the minimum strength required for excitation.
2. The minimum duration of electric current required to induce muscular contraction at a voltage of two times the threshold voltage.
3. The time interval needed to stimulate a nerve or muscle fiber electrically.
An instrument for measuring chronaxie.
chronaximetry, chronaximetric
The measurement of chronaxie.
chronic (adjective), more chronic, most chronic
1. A reference to diseases, etc.; lasting a long time: Rheumatism is usually a chronic ailment.
2. Descriptive of expressions of disapproval involving severe and objectionable behavior: Mike's friend was a chronic liar to such a degree that even when he told the truth no one believed him.
Relating to a perpetual habit or behavior.
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Descriptive of having a continuous and prolonged bad habit.
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chronic illness (s), chronic illnesses (pl) (nouns)
An illness that continues for a long time: "A chronic illness usually lasts three months or more."

In ancient Greece, Hippocrates, the 'father of medicine' distinguished diseases that were acute; that is, abrupt, sharp, and brief; from those that were chronic."

Of or pertaining to time; regulated by time.
The quality of being chronic.
1. A detailed and continuous register of events in order of time; a historical record; especially, one in which the facts are narrated without philosophic treatment, or any attempt at literary style.
2. A record, register, narrative, account; a frequent title of newspapers.
3. As a verb, to enter or record in a chronicle.
4. A time record of historical events.
A writer or compiler of a chronicle, a recorder of events.
To tell or write the history of; put into a chronicle; recount; record.