POLYAMIDE - See Nylon Fiber. 



POLYETHYLENE FIBER - A manufactured fabric in which the fiber- forming 

 substance is an olefin made from polymers or copolymers of ethylene. 



POLYMER - A high molecular chainlike structure from which manmade fibers 

 are derived; produced by linking together molecular units called monomers 

 - consisting predominantly of nonmetallic elements or compounds. 



POLYPROPYLENE FIBER - A manufactured fiber in which the fiber-forming sub- 

 stance is an olefin made from polymers or copolymers of propylene. 



POLYESTER FIBER - A manufactured fiber in which the fiber-forming substance 

 is any long chain synthetic polymer composed of at least 85 percent by 

 weight of an ester of dihydric alcohol and terephthalic acid (FTC) . 



POLYVINYLIDENE CHLORIDE FIBER - A manufactured fiber in which the fiber- 

 forming substance is a thermoplastic derived by copolymerization of two 

 or more vinyl monomers . 



PORT - A place where vessels may discharge or receive cargo; may be the 

 entire harbor including its approaches and anchorages, or may be the 

 commercial part of a harbor where the quays, wharves, facilities for 

 transfer of cargo, docks, and repair shops are situated. 



POZZOLAN - A siliceous rock of volcanic origin, first found near Puteoli 

 (modern Pozzuoli), Italy, used in preparing a hydraulic cement. 



PRECAST CELLULAR BLOCK - A cast or machine produced concrete block having 

 continuous void(s) through the vertical plane. Normally with smooth 

 vertical or near vertical sides (not interlocking). Some are cabled 

 together horizontally to form a mat. 



PUNCTURE RESISTANCE - Resistance to failure of a fabric due to a blunt 

 object applying a load over a relatively small area. Failure is due to 

 tensile failure of the fibers. 



QUARRYSTONE ARMOR UNITS - Relatively large quarrystones that are selected 

 to fit specified geometric characteristics, including compact dimensional 

 proportions and a nearly uniform size, usually large enough to require 

 individual placement. In normal cases they are placed in a layer at 

 least two stones thick. 



QUAY i (Pronounced KEY) - A stretch of paved bank, or a solid artificial 

 landing place parallel to the navigable waterway, for use in loading and 

 unloading vessels. 



RESIN BONDED - The fabric web is impregnated with a resin which serves to 

 coat and cement the fibers together. 



REVETMENT - A facing of stone, concrete, etc., built to protect a scarp, 

 embankments, or shore structure against erosion by wave action or currents. 



RHEOLOGY - Science dealing with the deformation and flow of matter. 



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