SINCE 1828
acrogen
noun
ac·ro·gen
| \ ˈa-krə-jən\
plural -s
Definition of acrogen
: a plant of the higher cryptogams predominant in the Carboniferous era including ferns, fern allies, mosses, and liverworts and distinguished by growth from a special cell or growing point — compare thallogen, thallophyte
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Merriam-Webster unabridged
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