# moly

/ˈmoʊɫi/ (US) · /mˈəʊli/ (UK) · CEFR C2 · Noun

Source: https://englishreference.com/word/moly
Updated: 2026-05-25

## Definition

a slang name for the metal molybdenum. It is often used in casual talk about heavy machinery or industrial tools.

For teachers: a colloquial or slang term for molybdenum, a metallic element with high melting point and strength. Common in industrial and mechanical contexts.

## Examples

- The mechanic used a moly coating on the engine parts.
- The factory workers referred to the high-strength alloy as moly because it was essential for the heavy-duty presses.
- While the technical specifications listed the alloy as a molybdenum-steel composite, the crew simply called it moly, reflecting the informal jargon of the industrial floor.

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From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.