inermousadj.
/ɪˈnəːməs/ Botany.
= inerm adj.
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the world > plants > part of plant > thorn or prickle > [adjective] > thornless
prickless1601
unthorny1646
unarmed1682
inerm1760
thornless1776
unthorned1806
inermous1828
1828 in N. Webster Amer. Dict. Eng. Lang. ; and in recent Dicts.
This entry has not yet been fully updated (first published 1900; most recently modified version published online June 2018).
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adj.1828