Definition of Jacob's staff
1 obsolete : a pilgrim's staff
2a obsolete : cross-staff 2 b less commonly Jacob staff : a short square rod with a cursor used for measuring heights and distances c less commonly Jacob staff : a straight rod or staff pointed and shod with iron at the bottom for insertion in the ground, having a socket joint at the top, and used instead of a tripod for supporting a compass
3 obsolete : a staff with a sword or dagger concealed in it
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Origin and Etymology of jacob's staff
after Jacob St. James, symbolized in religious art by a pilgrim's staff
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