How to Say "diameter" in Spanish
The Spanish word for “diameter” is “diámetro” — B1 level.
Examples
El círculo tiene un diámetro de cinco centímetros.
The circle has a diameter of five centimeters.
Necesitamos medir el diámetro de la tubería antes de comprar el repuesto.
We need to measure the diameter of the pipe before buying the replacement.
El diámetro del sol es mucho mayor que el de la Tierra.
The diameter of the sun is much larger than that of the Earth.
Always Masculine
Even though it talks about shapes (which are often feminine words like 'la forma'), 'diámetro' is always a masculine noun. Use 'el' or 'un' with it.
The Stress Mark Matters
The accent on the 'á' tells you to emphasize the third-to-last syllable. Without it, the word would be pronounced incorrectly.
Missing the Accent
Mistake: “El diametro es grande.”
Correction: El diámetro es grande. (Spanish requires the written accent because of where the voice naturally gets louder in this word.)
Confusing with Radius
Mistake: “Usar 'diámetro' para la mitad de un círculo.”
Correction: Use 'radio' for half the distance and 'diámetro' for the full distance across.
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