First in rank or importance; 'Primus' is also a brand of portable camping stove widely used for decades.
From Latin 'primus' meaning first, the superlative of 'prior' (early/first). It shows up in English in 'primary,' 'prime,' and 'primrose.'
The Primus stove became so popular that the brand name became synonymous with portable camping stoves—it's like how 'Band-Aid' means any adhesive bandage, but many people don't know it started as a specific product name from 1897.
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