Iatro- means treatment. A word that uses the combining form is iatrogenic, meaning caused by treatment. This term usually refers to a bad outcome of treatment. A common example is the iatrogenic yeast infection that some women get from antibiotic use.
There is no common abbreviation for pain in medical terminology. There may be on for a specific area or speciality. The combining form for "pain" is -algia or -dynia. Examples: Otalgia (pain in the ear -- earache) Cardiodynia (heart pain) Analgesia (no pain) Fibromyalgia (hurting muscles & tendons)
-stasis with -sta- meaning "to stand, remain standing" + -sis meaning "state of, process of, condition of, act of, and medically a diseased or morbid state". Common terms using -sta- are, stage, statue, stand, state, etc., along with numerous variants -stit-, -stab-, -stem-, -stet-, etc.
Large in medical terminology has the same meaning in common language. You may see "large" on a urinalysis report, for example leukocytes "large." It just means there was a fair number of white blood cells found in the urine.
Gastrostenosis Medical Terminology: Stomach: Gastro narrowing: Stenosis You may be referring to a condition that is common in this region known as Pyloric Stenosis; narrowing of the pylorus which is the opening to the stomach.