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Chri st|mas tree (Christmas trees ) N‑COUNT A Christmas tree is a fir tree, or an artificial tree that looks like a fir tree, which people put in their houses at Christmas and decorate with coloured lights and ornaments.

chro|mat|ic /krəmæ t I k/

1 ADJ In music, chromatic means related to the scale that consists only of semitones. □  …the notes of the chromatic scale.

2 ADJ [usu ADJ n] Chromatic means related to colours.

chrome /kroʊ m/ N‑UNCOUNT [oft N n] Chrome is metal plated with chromium. □  …old-fashioned chrome taps.

chro|mium /kroʊ miəm/ N‑UNCOUNT Chromium is a hard, shiny metallic element, used to make steel alloys and to coat other metals. □  …chromium-plated fire accessories.

chro|mo|so|mal /kroʊ məsoʊ m ^ə l/ ADJ [ADJ n] Chromosomal means relating to or connected with chromosomes. □  …chromosomal abnormalities.

chro|mo|some /kroʊ məsoʊm/ (chromosomes ) N‑COUNT A chromosome is a part of a cell in an animal or plant. It contains genes which determine what characteristics the animal or plant will have. □  Each cell of our bodies contains 46 chromosomes.

chron|ic /krɒ n I k/

1 ADJ [usu ADJ n] A chronic illness or disability lasts for a very long time. Compare acute . □  …chronic back pain. ●  chroni|cal|ly /krɒ n I kli/ ADV [ADV adj/-ed] □  Most of them were chronically ill.

2 ADJ [ADJ n] You can describe someone's bad habits or behaviour as chronic when they have behaved like that for a long time and do not seem to be able to stop themselves. □  …a chronic worrier.

3 ADJ [usu ADJ n] A chronic situation or problem is very severe and unpleasant. □  One cause of the artist's suicide seems to have been chronic poverty. ●  chroni|cal|ly ADV [ADV adj/-ed] □  Research and technology are said to be chronically underfunded.

chro n|ic fa|ti gue sy n|drome N‑UNCOUNT Chronic fatigue syndrome is an illness that is thought to be caused by a virus, and which affects people for a long period of time. Its symptoms include tiredness and aching muscles. The abbreviation CFS is often used.

chroni|cle /krɒ n I k ^ə l/ (chronicles , chronicling , chronicled )

1 VERB To chronicle a series of events means to write about them or show them in broadcasts in the order in which they happened. □ [V n] The series chronicles the everyday adventures of two eternal bachelors. [Also V wh] ●  chroni|cler (chroniclers ) N‑COUNT □ [+ of ] …the chronicler of the English civil war.

2 N‑COUNT A chronicle is an account or record of a series of events. □ [+ of ] …this vast chronicle of Napoleonic times.

3 N‑COUNT Chronicle is sometimes used as part of the name of a newspaper. □  …the San Francisco Chronicle.

chrono|logi|cal /krɒ nəlɒ dʒ I k ^ə l/

1 ADJ [usu ADJ n] If things are described or shown in chronological order, they are described or shown in the order in which they happened. □  I have arranged these stories in chronological order. ●  chrono|logi|cal|ly ADV [ADV after v, ADV -ed/adj] □  The exhibition is organised chronologically.

2 ADJ [ADJ n] If you refer to someone's chronological age, you are referring to the number of years they have lived, in contrast to their mental age or the stage they have reached in their physical or emotional development. [FORMAL ]

chro|nol|ogy /krənɒ lədʒi/ (chronologies )

1 N‑UNCOUNT The chronology of a series of past events is the times at which they happened in the order in which they happened. □ [+ of ] She gave him a factual account of the chronology of her brief liaison.

2 N‑COUNT A chronology is an account or record of the times and the order in which a series of past events took place. □ [+ of ] The second part of Duffy's book is a detailed chronology of the Reformation.