Ionograms

Part of speech: noun

Definitions

1. A graphical representation of ion concentrations at various altitudes in the atmosphere over time
2. a visual chart used in ionospheric studies to show electron density variations
3. a plotted data format that illustrates the behavior of ionized particles in relation to altitude and time

Etymology: "Ionograms" is the plural of "ionogram," a term for a plotted record that shows how ionized particles behave at different altitudes over time. The word is built from two parts: "iono-," a combining form drawn from "ion," the charged particle whose name comes from Greek "ion," meaning "going," and "-gram," from Greek "gramma," meaning "something written" or "a drawn line." Put together, the sense is simply a written record of ionization. The plural form simply counts multiple such records, so a set of ionograms would be several charts recorded over time. Because the word is a transparent combination of standard scientific parts rather than an older English word, its history is essentially the history of the modern scientific vocabulary that produced it, and its meaning follows directly from those parts.