athalamous

adjective
athal·​a·​mous | \(ˈ)āˈthaləməs\

Definition of athalamous 

1 : lacking a torus or receptacle athalamous flowers

2 : without apothecia, beds, or shields for spores athalamous lichens

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History and Etymology for athalamous

a- entry 2 + Latin thalamus marriage bed, bedroom (from Greek thalamos bedroom, room) + English -ous; akin to Greek tholos rotunda

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