prothallus definition, prothallus meaning | English dictionary

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, prothallium  
      n   pl   , -li   , -lia     (Botany)   the small flat free-living green disc of tissue that bears the reproductive organs of ferns, horsetails, and club mosses  
     (C19: from New Latin, from pro- before + Greek thallus a young shoot)  
  prothallic, prothallial      adj  
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