Definitions from Wiktionary ( )

▸ noun:  A deep, wide defensive ditch, normally filled with water, surrounding a fortified habitation.
▸ noun:  (business, figurative) An aspect of a business which makes it more "defensible" from competitors, because of the nature of its products, services or franchise or for some other reason.
▸ noun:  A circular lowland between a resurgent dome and the walls of the caldera surrounding it.
▸ noun:  (meteorology) A clear ring outside the eyewall of a tropical cyclone.
▸ noun:  (obsolete) A hill or mound.
▸ verb:  (transitive) To surround with a moat.
▸ noun:  A surname.

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