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Ambulacrum is a 10 letter word which starts with the letter A and ends with the letter M for which we found 2 definitions.

(n.) One of the radical zones of echinoderms along which run the principal nerves blood vessels and water tubes. These zones usually bear rows of locomotive suckers or tentacles which protrude from regular pores. In star fishes they occupy the grooves along the under side of the rays.
(n.) One of the suckers on the feet of mites.
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