| thall | a soft gray malleable metallic element that resembles tin but discolors on exposure to air |
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| thall | of or relating to or resembling or consisting of a thallus |
| thall | used only in former classifications: comprising what is now considered a heterogeneous assemblage of flowerless and seedless organisms: algae |
| thall | any of a group of cryptogamic organisms consisting principally of a thallus and thus showing no differentiation into stem and root and leaf |
| thall | pertaining to or characteristic of thallophytes |
| thall | a plant body without true stems or roots or leaves or vascular system |