ion

noun ee-OHN Rare

Origin: Greek ion (going) — a particle that moves in a field

Usage Note

Ion is the general chemistry and physics term for an electrically charged atom or molecule. Positively charged ions are cationes and negatively charged ones are aniones. The plural is iones. The written accent on ión is often seen in older texts, though modern usage (ion) does not require it since the monosyllable needs no accent mark in standard orthography.

Examples

"Los iones de sodio regulan la presión osmótica."

Natural Translation

Sodium ions regulate osmotic pressure.

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