The flask-shaped female reproductive organ in non-seed plants like mosses, ferns, and liverworts that contains the egg cell. It has a narrow neck and a swollen base where fertilization occurs.
From Greek 'archegonos' meaning 'first-born' or 'original', reflecting its role as the ancestral type of female reproductive structure in plants. The term was coined in the 1850s as botanists studied the reproductive organs of primitive plants and recognized their fundamental importance in plant evolution.
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