cata-, cat-, cath-, kata-

(Greek: down, downward; under, lower; against; entirely, in accordance with, completely; definitely)

Migrating from fresh water into the ocean to spawn or fish that live in fresh water, but breed in the sea.

Catadromous fish are freshwater eels of genus Anguilla, whose larvae drift on the open ocean, sometimes for months or years, before traveling thousands of kilometers back to their original streams.

catagelophobia, categelophobia (s) (noun) (no plural)
An excessive antipathy of being ridiculed, of being put down, or criticized in a derogatory way: The catagelophobia that a person may have is no doubt based on what others have said previously in a very depreciative, slighting, discreditable, and belittling way.
Names of months and days in Catalan.
catalepsy (s) (noun), catalepsies (pl)
1. A situation or condition that is usually associated with schizophrenia in which the muscles become rigid, and the arms and legs keep the positions in which they have been placed: Catalepsy is seen in psychotic patients during which there is a generalized and diminished responsiveness that is marked by a trancelike state.

Nurses and physicians have been warned that, although a patient is in a trance of catalepsy, he or she may still be able to hear and to understand their conversations; so, the medical staff's actions and talks about such a patient, in his or her presence, should be the same as if that person were fully conscious.
2. Etymology: from Greek catalepsis; from kata-, "down" + lepsis, "seizure"; a derivative of lambanein, "to seize".

A sudden seizure that causes a human or animal to be unable to move.
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catalyst (s) (noun), catalysts (pl)
1. Someone or something that quickly makes certain things happen or causes events to take place: The destruction of the Twin Towers in New York on September 11, 2001, was the catalyst for U.S. attacks against terrorists in Iraq, Afghanistan, Pakistan, etc.

The first successful heart transplant was the catalyst which started the widespread medical development in the field of cardiology.

2. A substance that increases the rate of a chemical reaction without itself undergoing any change: All enzymes are catalysts and the human body has thousands of enzymes, each of which is specific in causing or accelerating changes in other substances within all living organisms.

Enzymes are important catalysts during digestion and many other functions in the body.

A stimulus or speeding up a result.
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catamnesis (s) (noun), catamneses (pl)
1. The follow-up medical, or also a psychiatric, history after a person is discharged from special treatment or a hospital: Jane kept a copy of the catamnesis, which was the information collected by the doctor's questions and was useful in providing a diagnosis and her follow-up medical care.
2. The case history of a patient after the onset of a medical or a mental illness, or following an illness: Dr. Smith didn't use the term catamnesis, but used the term medical record, to describe the questions he asked Sam and Sam's answers regarding his health situation, in addition to the physical exams that had taken place.