Meaning

noun creeping European clover having white to pink flowers and bright green leaves; naturalized in United States; widely grown for forage

noun Eurasian plant with heart-shaped trifoliate leaves and white purple-veined flowers

noun clover native to Ireland with yellowish flowers; often considered the true or original shamrock

originFrom Irish seamróg, from Old Irish semróc, diminutive of semar, semair (“clover”), from Proto-Celtic *semarā, *semaris (compare Gaulish uisumaris (“clover”)), possibly from Proto-Indo-European *semh₁r-, *smeh₁r-. Related to Old Norse smári (“clover”) and possibly Georgian სამყურა (samq̇ura, “clover”).

Etymology from Wiktionary, CC BY-SA 3.0