From a piece by Gina Kolata in the NYT yesterday, “Antibiotics Are Effective in Appendicitis, Study Says”:
The results only apply to uncomplicated appendicitis, stressed Dr. Paulina Salminen, a surgeon at Turku University Hospital in Finland and lead author of the new study. She and her colleagues excluded from their trial the 20 percent of patients with complicated cases — people with perforated appendices or abdominal abscesses, and those with a little, rocklike blockage of the appendix called an appendicolith.
Yes, appendicolith, (with the stem of appendix plus the lith– ‘rock, stone’ stem), not a word you’re likely to have come across before. But an obviously useful technical term in this medical context, replacing the wordy explanation ‘little, rocklike blockage of the appendix’ or the somewhat more specific and compact ‘a calcified deposit within the appendix’ on the Radiopaedia.org site. Let’s face it, we have no ordinary-language term for this referent.
(Phonological note: the word seems to have the same accent pattern as appendectomy, with alternating accent: primary accent on the third syllable, secondary on the first, tertiary on the fifth, with unaccented second and fourth syllables.)