• WordNet 3.6
    • adj fissile capable of being split or cleft or divided in the direction of the grain "fissile crystals","fissile wood"
    • adj fissile capable of undergoing nuclear fission "a fissionable nucleous","fissionable material"
    • ***
Webster's Revised Unabridged Dictionary
    • Fissile Capable of being split, cleft, or divided in the direction of the grain, like wood, or along natural planes of cleavage, like crystals. "This crystal is a pellucid, fissile stone."
    • Fissile Fissionable.
    • ***
Century Dictionary and Cyclopedia
    • fissile Capable of being split, cleft, or divided into layers, as wood in the direction of the grain, or certain minerals and rocks in the planes of cleavage or foliation. See schist and cleavage.
    • fissile In entomology, formed of plates or scales which are closely appressed in repose, but may be spread apart: an epithet sometimes applied to lamellate antennæ.
    • ***
Chambers's Twentieth Century Dictionary
    • adj Fissile fis′il that may be cleft or split in the direction of the grain
    • ***


Webster's Revised Unabridged Dictionary
L. fissilis, fr. fissus, p. p. of findere, to split. See Fissure
Chambers's Twentieth Century Dictionary
L. fissilis, from findĕre, fissum, to cleave.


In literature:

Associated Words: fissile, fissility.
"Putnam's Word Book" by Louis A. Flemming
Fissile, capable of being split.
"The Mushroom, Edible and Otherwise" by M. E. Hard
CLINKSTONE, called also phonolite, a felspathic rock of the trap family, usually fissile.
"Principles of Geology" by Charles Lyell
The same composition as hornblende-schist, stratified, but not fissile.
"A Manual of Elementary Geology" by Charles Lyell
The neighbouring mountain abounded with a very black fissile aluminous stone.
"Lachesis Lapponica" by Carl von Linné
Most usually the 'cleavage,' as this fissile structure is termed, crosses the bedding at all angles.
"Geology" by James Geikie
The second is made of brownish fissile jasper and was found in grave No.
"The Archaeology of the Yakima Valley" by Harlan Ingersoll Smith

In news:

After a profitable opening day at the Nuclear Security Summit, President Obama hopes for further gains in promoting an international cooperative effort to secure fissile materials.