shamrock
noun
sham·rock ˈsham-ˌräk 
: a trifoliolate plant used as a floral emblem by the Irish: such as
a
: a yellow-flowered Old World clover (Trifolium dubium) often regarded as the true shamrock
b
: wood sorrel
c
: white clover
Example Sentences
Recent Examples on the Web Hartnell also stitched a four-leaf shamrock for good luck on the left side of the skirt, placed precisely where Queen Elizabeth's hand would fall during the ceremony. 
Stephanie Kaloi, Peoplemag, 15 Sep. 2022 She had been moved by the valor of the Irish troops in the Boer War, and the lore is that an officer asked the sovereign if the Irish regiments in the British army could wear the shamrock on their helmets on St. Patrick’s Day. Peggy Noonan, WSJ, 15 Sep. 2022 Satisfy your sweet tooth with festive St. Patrick's Day desserts, including cute shamrock cookies, Irish creme cheesecake, and colorful rainbow cupcakes. Sarah Martens, Better Homes & Gardens, 21 Aug. 2022 Grabbing brushes and cans of green paint, members of the society filled in each shamrock, marking the beginning location of Sunday's parade route. Lauren Wethington, Detroit Free Press, 11 Mar. 2022 The ivory gown’s lace sleeves and V-neck bodice included floral details of rose, thistle, daffodil, and shamrock—flowers that represent the four regions of the United Kingdom—as well as a nine-foot train. Elise Taylor, Vogue, 14 July 2022 Her knuckles and wrists have various tattoos including names in cursive for family as well as a shamrock and a Chanel symbol. Liana Satenstein, Vogue, 15 June 2022 As part of his intricate design, Hartnell included a four-leaf shamrock on the left side of the skirt, which was positioned perfectly so that Her Majesty's hand would rest on it during the ceremony. Monique Jessen, PEOPLE.com, 1 June 2022 The Duchess of Cambridge wore head-to-toe green and wore a gold Cartier shamrock brooch. Chloe Foussianes, Town & Country, 17 Mar. 2022 See More
Stephanie Kaloi, Peoplemag, 15 Sep. 2022 She had been moved by the valor of the Irish troops in the Boer War, and the lore is that an officer asked the sovereign if the Irish regiments in the British army could wear the shamrock on their helmets on St. Patrick’s Day. Peggy Noonan, WSJ, 15 Sep. 2022 Satisfy your sweet tooth with festive St. Patrick's Day desserts, including cute shamrock cookies, Irish creme cheesecake, and colorful rainbow cupcakes. Sarah Martens, Better Homes & Gardens, 21 Aug. 2022 Grabbing brushes and cans of green paint, members of the society filled in each shamrock, marking the beginning location of Sunday's parade route. Lauren Wethington, Detroit Free Press, 11 Mar. 2022 The ivory gown’s lace sleeves and V-neck bodice included floral details of rose, thistle, daffodil, and shamrock—flowers that represent the four regions of the United Kingdom—as well as a nine-foot train. Elise Taylor, Vogue, 14 July 2022 Her knuckles and wrists have various tattoos including names in cursive for family as well as a shamrock and a Chanel symbol. Liana Satenstein, Vogue, 15 June 2022 As part of his intricate design, Hartnell included a four-leaf shamrock on the left side of the skirt, which was positioned perfectly so that Her Majesty's hand would rest on it during the ceremony. Monique Jessen, PEOPLE.com, 1 June 2022 The Duchess of Cambridge wore head-to-toe green and wore a gold Cartier shamrock brooch. Chloe Foussianes, Town & Country, 17 Mar. 2022 See More Word History
Etymology
Irish seamróg, diminutive of seamar clover
First Known Use
1577, in the meaning defined above
Kids Definition
shamrock
noun
sham·rock ˈsham-ˌräk
: a plant (as some clovers) that has leaves with three leaflets and is used as an emblem by the Irish