Hi David L.,
As a rule I use my old English-Bulgarian Dictionary but it is of no importance for you. There are many other English Dictionary where you might find the word in question if the will is there.
Encarta World Dictionary wisp = a small bundle of straw or hay
Compact Oxford English Dictionary wisp = a small thin bunch, strand, or amount of something
Merriam-Webster's Online Dictionary wisp = a small handful (as of hay or straw)
The Wordsmyth English Dictionary-Thesaurus wisp = a thin bundle, bunch, tuft, streak, or the like, as of straw, hair, or smoke
American Heritage® Dictionary of the English Language A wisp = small bunch or bundle, as of straw, hair, or grass.
Online Etymology Dictionary wisp = handful or bundle of hay, grass, etc perhaps from an unrecorded O.E. word, cognate with Norw. and Swed. visp "wisp," of unknown origin; sometimes said to be connected with whisk or with M.L.G. and M.Du. wispel "a measure of grain." Meaning "thin, filmy portion"
……and many other….
The old farmers in my country bound the sheaves with the help of the wisps in the place of rope, wire or pack-thread.