Definition of "folium" [fo•li•um]

• Geology A thin, leaflike layer or stratum occurring especially in metamorphic rock. (noun)
• Mathematics A plane cubic curve having a single loop, a node, and two ends asymptotic to the same line. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "You have got a distinct notion, I hope, of leaf-crystals; and you see the sort of look they have: you can easily remember that 'folium' is Latin for a leaf, and that the separate flakes of mica, or any other such stones, are called"
• "Et venit ad eum columba tempore vespertimo, et ecce, folium olivae raptum erat in ore ejus, et cognovit Noah quod extenuatae essent aquae"
• ""Dicunt aquilam quum in altum volare voluerit ut prospiciat rerum naturas lactucoe sylvaticoe folium evellere et succo ejus sibi oculos tangere, et maximam inde claritudinem accipere.""