Comparative form of 'greasy'; more oily, slippery, or containing more grease than something else.
From 'greasy' + '-er' (comparative suffix); 'greasy' itself comes from 'grease,' and the comparative adds '-er' following standard English adjective comparison patterns.
English's two-part comparison system (short adjectives get '-er' and '-est,' long ones use 'more/most') shows how language evolved—'greasy' is short enough that we say 'greasier' rather than 'more greasy,' and this intuition is felt by all native speakers instantly.
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