No etymology entry found for "telemetry" on Etymonline.
telemetry came in through Greek, and its spelling follows that family's conventions.
How that family writes these sounds
| a technical compound you could take apart | the combining forms: auto-, bio-, micro-, tele-, -logy, -graph, -meter, -scopebiography, microscope, telemetry |
What gives it away on the page
| auto-, bio-, micro-, tele-, -logy, -graph, -meter, -scope, -phobia | Combining forms, still productive today.biography, telemetry, microscope |