A device that is placed over or behind the propeller of a boat to deflect the vessel's propwash downward. The result is a very effective form of agitation dredging. PDUs are primarily used by salvors to remove mud or sand from shallow water shipwrecks.

(computer hardware) the section of a CPU that performs calculations and logical operations

(US, geography) The portion of the United States which is located on the North American continent; the United States exclusive of Hawaii and other overseas territories.

Laborers are encouraged to unionize or otherwise engage in collective action on a global scale in order to use the strength of their numbers to obtain better conditions.

The official name of Tanzania, a country in East Africa.

(US) A police dog or a police dog and its handler.

A terminal node in phylogenetic analysis; an organism.

An internal node in phylogenetic analysis; an inferred ancestral organism.

(law) A compilation of the statutes of the United States federal government, with sections arranged by topic rather than by date of enactment, and with superseded and expired sections removed.

(healthcare) An area for patients who require more intensive observation, treatment and nursing care than would be usually provided on a general ward. A standard of care between the general ward and full intensive care.