Is it ensure, insure, or assure?
Old English lilie, from Latin lilia, plural of lilium "a lily," cognate with Greek leirion, both perhaps borrowed from a corrupted pronunciation of an Egyptian word. Used in Old Testament to translate Hebrew shoshanna and in New Testament to translate Greek krinon. As an adjective, 1530s, "white, pure, lovely;" later "pale, colorless" (1580s).
Also from the Latin word are German lilie, French lis, Spanish lirio, Italian giglio. The lily of the valley translates Latin lilium convallium (Vulgate), a literal rendition of the Hebrew term in Song of Solomon ii:1. It apparently was applied to a particular plant (Convallaria majalis) first by 16c. German herbalists. Lily pad is from 1834, American English.
The Hebrew name shushan or shoshan, i.e., "whiteness", was used as the general name of several plants common to Syria, such as the tulip, iris, anemone, gladiolus, ranunculus, etc. Some interpret it, with much probability, as denoting in the Old Testament the water-lily (Nymphoea lotus of Linn.), or lotus (Cant. 2:1, 2; 2:16; 4:5; 5:13; 6:2, 3; 7:2). "Its flowers are large, and they are of a white colour, with streaks of pink. They supplied models for the ornaments of the pillars and the molten sea" (1 Kings 7:19, 22, 26; 2 Chr. 4:5). In the Canticles its beauty and fragrance shadow forth the preciousness of Christ to the Church. Groser, however (Scrip. Nat. Hist.), strongly argues that the word, both in the Old and New Testaments, denotes liliaceous plants in general, or if one genus is to be selected, that it must be the genus Iris, which is "large, vigorous, elegant in form, and gorgeous in colouring." The lilies (Gr. krinia) spoken of in the New Testament (Matt. 6:28; Luke 12:27) were probably the scarlet martagon (Lilium Chalcedonicum) or "red Turk's-cap lily", which "comes into flower at the season of the year when our Lord's sermon on the mount is supposed to have been delivered. It is abundant in the district of Galilee; and its fine scarlet flowers render it a very conspicous and showy object, which would naturally attract the attention of the hearers" (Balfour's Plants of the Bible). Of the true "floral glories of Palestine" the pheasant's eye (Adonis Palestina), the ranunuculus (R. Asiaticus), and the anemone (A coronaria), the last named is however, with the greatest probability regarded as the "lily of the field" to which our Lord refers. "Certainly," says Tristram (Nat. Hist. of the Bible), "if, in the wondrous richness of bloom which characterizes the land of Israel in spring, any one plant can claim pre-eminence, it is the anemone, the most natural flower for our Lord to pluck and seize upon as an illustration, whether walking in the fields or sitting on the hill-side." "The white water-lily (Nymphcea alba) and the yellow water-lily (Nuphar lutea) are both abundant in the marshes of the Upper Jordan, but have no connection with the lily of Scripture."
the common name applied to herbaceous flowering plants belonging to the genus Lilium of the family Liliaceae. The genus contains between 80 and 100 species, native to the temperate areas of the Northern Hemisphere. Lilies are prized as ornamental plants, and they have been extensively hybridized.