trifolium

From the genus name.

trifolium (plural trifoliums or trifolia)

1. (botany) Any of the genus Trifolium of clovers and trefoils.
   • 1867, Wilson Flagg, “The Early Wild Flowers”, in The Magazine of Horticulture, Botany, and All Useful Discoveries, page 155:

     The larger species (Panax quinquefolium) is rather coarse and ordinary in its appearance; the flowers are very nearly like those of the trifolia, but grow in an irregular and elongated cluster.

   • 2012, Douglas M. Considine, Foods and Food Production Encyclopedia, page 441:

     The majority of the trifoliums are native to Europe and Asia. Only comparatively few of the trifoliums native to the United States are of food production significance.

• lituiform

From tria (“three”) + folium (“a leaf”), a calque of Ancient Greek τρίφυλλον (tríphullon).

(Classical) IPA^(key): /triˈfo.li.um/, [t̪rɪˈfɔlʲiʊ̃ˑ]

• (Ecclesiastical) IPA^(key): /triˈfo.li.um/, [t̪riˈfɔːlium]

trifolium n (genitive trifoliī or trifolī); second declension

1. trefoil, clover

Second-declension noun (neuter).

¹Found in older Latin (until the Augustan Age).

• trifolium hepaticum

• trifoliatus

• “trifolium”, in Charlton T. Lewis and Charles Short (1879) A Latin Dictionary, Oxford: Clarendon Press
• trifolium in Charles du Fresne du Cange’s Glossarium Mediæ et Infimæ Latinitatis (augmented edition with additions by D. P. Carpenterius, Adelungius and others, edited by Léopold Favre, 1883–1887)
• trifolium in Gaffiot, Félix (1934) Dictionnaire illustré latin-français, Hachette