Webster's English Dictionary

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mycelium

my.ce.li.um \-le--*m\ \-le--*\ n or my.ce.lia [NL, fr. myc- + Gk he-los 
   nail, wart, callus] pl  : the mass of interwoven filamentous hyphae that 
   forms esp. the vegetative  portion of the thallus of a fungus; also : a 
   similar mass of filaments formed by a higher bacterium