syn-, sy-, sym-, syl-, sys-

(Greek: with, together with; also by extension: united; same, similar; at the same time)

1. A symbiont that lives within the body of the host.
2. An organism which lives within the body of another organism (its host) as part of an endosymbiotic relationship.
A reference to a symbiosis in which one symbiont lives within the body of another as green algae in Hydra or Convoluta.
1. Symbiosis in which one organism lives inside the body of another and both function as a single organism.
2. A symbiotic relationship between two organisms in which one of the two organisms (the endosymbiont) lives inside the body of the other one (the host).
1. A reference to, or pertaining to, endosymbiosis.
2. That which lives within a body, or cells, of another organism; forming an endosymbiosis.
fetal transfusion syndrome (s) (noun), fetal transfusion syndromes (pl)
A rare condition that occurs only in identical twins while the babies are still in the womb and involves the transfer of blood from one twin to the other one.
fibromyalgia syndrome
These vary, with pain and fatigue generally prominent, sometimes causing considerable disability.

Patients can usually dress and wash independently, but they can not cope with a job or household activities.

Patients generally score highly on measures of anxiety and depression.

geosynchronistic (adjective) (not comparable)
A reference to a satellite which has an orbit which appears to be fixed in a position related to the Earth: A geosynchronistic spacecraft does not necessarily lie in the Earth's equatorial plane as it is when it is "geostationary".
geosynchronous (adjective) (not comparable)
Referring to any equatorial satellite with an orbital velocity equal to the rotational velocity of the Earth resulting in a satellite that is apparently motionless for any observer on the Earth: A geosynchronous satellite has an orbit similar to a geostationary one, except that it does not necessarily lie in the Earth's equatorial plane.

geosyncline (s) (noun), geosynclines (pl)
An extensive, basin-shaped, mobile downward subsidence of the Earth's crust: A geosyncline is caused by the deposition of a considerable thicknesses of sedimentary and volcanic rocks over millions of years.
A reference to a symbiotic association of several members, particularly of a lichen containing several species of algae.
The entire duration of the normal rhythmical contraction of the heart, during which the blood in the chambers is forced onward.
Referring to the first and to the second heart sounds or the duration of the normal contraction of the heart.
hypermobility syndrome, hypermobile syndrome
1. Unusual flexibility of the joints or greater than the normal range of motion in a joint, allowing them to be bent or moved beyond their normal range of motion.

Hypermobility is often misused to describe extra movements as seen in a contortionist.

2. Increased range of the movement of joints, joint laxity, occurring normally in young children or as a result of disease; such as, Marfan's syndrome (disorder of connective tissue of musculoskeletal system or abnormal length of the limbs; especially the fingers and the toes) or Ehlers-Danlos syndrome (disorder of the connective tissue; such as, joints that bend too easily into extensions).
3. Excessive joint play (movement) which permits increased mobility.

The area where two bones meet is called a joint and all joints have a cavity containing a small amount of synovial fluid, which allows for movement.

The attached tendons, muscles, ligaments, and joint capsules hold the joints in their correct positions.

Looseness of these supporting structures allows a joint to have extra motion and often, even normal activities that put stress on loose joints will irritate them.

Hypermobility syndrome may include congenital hip dislocations; scoliosis (curvature of the spine); elbow, kneecap and/or shoulder dislocations; or frequent ankle or wrist sprains.

idiosyncrasy (s) (noun), idiosyncrasies (pl)
1. A way of behaving, thinking, or feeling that is peculiar to an individual or group; especially, an odd or unusual one; also, a distinctive characteristic of an object or a thing: The old printer that Joan has at home has a specific idiosyncrasy in that it growls loudly while it's printing!
2. In pharmacology, an abnormal reaction to a drug or food, sometimes specified as genetically determined, but not caused by an allergy: Gregory’s idiosyncrasy was obvious as was shown by his hypersensitiveness to drinking only one glass of wine in the evening after having one aspirin earlier in the day, because he became quite tipsy and talkative.
3. The mental constitution peculiar to a person or class of people; an individual bent of mind or inclination; a view or feeling, a liking or aversion, peculiar to a single person, race, or nation: The idiosyncrasy that Alfred had of bowing and kissing the hand of the ladies he met at the party was very peculiar, or strange, since this is not a custom in these present times.
A peculiarity of an individual.
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A special mental or physical oddity that someone has.
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Peculiar to a particular disease.

Inter-related cross references, directly or indirectly, involving word units dealing with "equal, identical, same, similar": auto-; emul-; equ-, equi-; homeo-; homo-; iso-; pari-; peer; rhomb-; tauto-.