retro-, retr-

1. An unpaid or an overdue debt or an unfulfilled obligation; usually used in the plural form.
2. A situation when someone is behind in fulfilling obligations: "His car payments are in arrears; and as a result, his car may be repossessed."
3. Money that is not paid when due usually, the sum of a series of unpaid amounts; such as, rent, installments on an account, a promissory note, or monthly child support.

Sometimes these are called "arrearages" or the state or condition of being in arrears.

4. Arrearages are overdue alimony or child support payments.

Child support arrearages can't be discharged in bankruptcy, and courts usually will not retroactively cancel them; so, a spouse or parent who falls on tough times and is unable to make payments should request a temporary modification of the payments before the arrearages build up.

5. Etymology: from Old French ariere, "behind, backward"; from Common (Vulgar) Latin ad retro, from Latin ad, "to" + retro, "behind".

A back flow of menstrual discharge through the uterine cavity and fallopian tubes into the peritoneal cavity which is a reference to the peritoneum, a smooth transparent membrane that lines the abdomen and doubles back over the surfaces of the internal organs to form a continuous sac.

Fragments of endometrium (mucous membrane that lines the uterus) may attach to the ovaries or other organs, causing endometriosis; a medical condition in which the mucous membrane endometrium that normally lines only the womb is present and functioning in the ovaries or elsewhere in the body.

Endometriosis is very common and may not produce symptoms, or it may lead to painful menstruation. It has also been associated with infertility.

Endometriosis occurs most commonly within the Fallopian tubes and on the outside of the tubes and ovaries, the outer surface of the uterus and intestines, and anywhere on the surface of the pelvic cavity.

It can also be found, less often, on the surface of the liver, in old surgery scars or, very rarely, in the lungs or brain.

1. To give back or to give something back to someone; such as, land or a territory.
2. To go back or to recede.
3. Etymology: from Latin retrocedere, "to go back" from retro-, "back" + cedere, "to go".

Characterized by running, or stepping, backward.

1. The act of bending backward.
2. An articulatory gesture made by turning the tip of the tongue back against the roof of the mouth.
3. A turning or tilting backward of an organ or body part.
4. A bending backward of the body of the uterus upon the cervix.
5. The acoustic quality resulting from retroflex articulation.

1. Bent, curved, or turned backward.
2. Pronouncing certain words and/or letters with the tip of the tongue turned back against the roof of the mouth.
3. A sound pronounced with the tongue in retroflex position, as the sound "r" in some varieties of English.