Webster's English Dictionary

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thallus

thal.lus \'thal-*s\ \'thal-.i-, -.e-\ n or thal.li or thal.lus.es [NL, fr. 
   Gk thallos, fr. thallein to sprout; akin to Alb dal] pl I come forth : a 
   plant body that is characteristic of thallophytes, lacks differentiati on 
   into distinct members (as stem, leaves, and roots), and does not grow from 
   an apical point