Plural form of 'henry,' the SI unit of electrical inductance in physics and electrical engineering.
Same etymology as 'henries'—named after Joseph Henry. Both 'henries' and 'henrys' are used as plural forms, though 'henries' is more standard in scientific writing.
It's unusual for unit plurals—we mostly just use the singular form ('five meter,' not 'five meters' in strict scientific notation), but 'henry' often gets pluralized in practical speech!
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