tick-tacker n. at a horse track, a person (often a tout) who communicates information to others by hand signals. (source: Double-Tongued Dictionary)
Further reading
Asthenosphere, a geologist’s term for the molten layer beneath the earth’s crust, sparks a journey that stretches all the way from ancient Greece to the author of Uncle Tom’s Cabin. Plus: What the heck is a dogberg? It’s when...
Janet in Montgomery, Alabama, reports that a day after she had surgery on her hand, the wound burst open, and a doctor noted that her wound dehisced. She’s used to hearing dehisce used in botany to mean the splitting of a plant structure to...