acrogen

noun

ac·​ro·​gen

ˈa-krə-jən

plural -s

: 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

Word History

Etymology

acr- + -gen; from the growing point's being at the tip of the stem

First Known Use

1834, in the meaning defined above

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