chronˈic adjective

1. Lasting a long time
2. (of a disease) deep-seated or long continued, opp to acute (chronic fatigue syndrome a long-term post-viral syndrome with chronic fatigue and muscle pain on exercise)
3. Deplorable (slang)
4. Relating to time (obsolete)

1. A chronic invalid
2. A student who repeatedly fails in examinations (old slang)

chronˈical adjective

Chronic

chronˈically adverb

chronicˈity noun

chronobiolˈogy noun

The science of biological rhythms, esp where the properties of the rhythms are measured

chronˈogram noun

(Gr gramma letter) an inscription or phrase in which letters form a date in Roman numerals

chronˈograph noun

1. (Gr graphein to write) a chronogram
2. An instrument for taking exact measurements of time, or for recording graphically the moment or duration of an event

chronogˈrapher noun

A chronicler

choronographˈic adjective

chronogˈraphy noun

Chronology

chronolˈoger noun

chronologˈic or chronologˈical adjective (chronological age age in years, etc, as opposed eg to mental age)

chronologˈically adverb

chronolˈogist noun

chronolˈogize or chronolˈogise transitive verb

To arrange in chronological order or establish the order in time of (events, etc)

chronolˈogy noun

1. (Gr logos discourse) the science of computing time
2. A scheme of time
3. Order of time

chronomˈeter noun

(Gr metron measure) an instrument for accurate measurement of time

chronometˈric or chronometˈrical adjective

chronometˈrically adverb

chronomˈetry noun

1. The art of measuring time accurately by means of instruments
2. Measurement of time

chrōˈnon noun (physics)

A unit of time, ie that required for a photon to travel the diameter of an electron, 10⁻²⁴ seconds

chronˈoscope noun

(Gr skopeein to look) an instrument used for measuring extremely short intervals of time, esp in determining the velocity of projectiles

chronˈotron noun

A device which measures very small time intervals by comparing the distance between electric pulses from different sources