A small appendage or tiny appendix; a diminutive form suggesting something small attached to a larger structure.
From Latin appendix + -cle (diminutive suffix, as in particle, corpuscle). The -cle ending indicates a small version, though this word is quite rare in modern usage.
English uses -cle for tiny things—particle, molecule, globule—so 'appendicle' logically means a 'tiny appendage.' But we prefer 'small appendage' instead, showing how not all logical word-formations survive into common use!
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