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Webster 1913 Edition

Adj.

Performing like a ropedancer.

Chambers.

Narrow, like the walk of a ropedancer.

This funambulatory track.

Sir T. Browne.

Adj.

Performing like a rope dancer; narrow like the walk of a rope dancer.

funambulatory ‎(not comparable)

Performing in the manner of a tightrope walker.
(Can we find and add a quotation of Chambers to this entry?)
narrow, like a tightrope
This funambulatory track. — Sir T. Browne.