spawning areas to provide a suitable substratum for growth 

 of oysters. 



Cultigen 



A plant or a group of plants that is grown only under 

 cultivation so far as is known, e. g., cabbage, cf. Indigen. 



Cultivar 



A strain, variety, or race which originated and is main- 

 tained under cultivation; not necessarily a species. 



Culture Community 



A Community brought about by man's activity, e. g., a 

 seeded meadow; or a natural community greatly altered by 

 man. cf. Hemerocology, Secondary succession. 



Curie 



The basic measure or unit of radioactivity of a substance, 

 the disintegration of a Radioactive Isotope at the rate of 3.7 

 times 10 10 atoms of material per second. 



Cushion Plant 



An herbaceous perennial plant that produces a form with 

 a dense mass of short stems and many leaves. 



Cuticle 



A covering of fairly water-proof material composed of 

 Cutin in higher plants, or chitin and/or protein in many 

 animals. 



Cutin 



A mixture of waxlike materials forming the Cuticle of 

 higher plants. 



Cut-over Forest 



A forest from which some or all of the merchantable trees 

 have been removed, cf. Culled forest, syn. Logged-over. 



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