Seeds of a plant supposedly useful for repelling fleas, or the plant itself that produces such seeds.
Compound of 'flea' and 'seed,' from herbalist terminology. Medieval and early modern herbals listed fleaseed as an ingredient in flea-repelling remedies.
Medieval herbalists had entire recipes using 'fleaseed' combined with other ingredients to make flea-repellent powders—science or not, at least the house smelled like herbs!
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