Medical Dictionary

thallus

noun thal·lus \ˈthal-əs\
plural thal·li \ˈthal-ˌī, -ˌē\ or thal·lus·es

Medical Definition of THALLUS

:  a plant or plantlike body (as of an alga, fungus, or moss) that lacks differentiation into distinct members (as stem, leaves, and roots) and does not grow from an apical point

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