First Known Use: 1661
Dictionary
fissile
adjective fis·sile \ˈfi-səl, ˈfi-ˌsī(-ə)l\
Definition of FISSILE
1
: capable of or prone to being split or divided in the direction of the grain or along natural planes of cleavage <fissile wood> <fissile crystals>
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Origin of FISSILE
Latin fissilis, from findere
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