osmophore
/ˈɒzməfɔː/noun
1 Chemistry and Physiology. A chemical group whose presence in the molecules of a substance causes the substance to have a smell.
2 Botany. A scent gland found in the flowers of certain plants, especially orchids.
Origin
Early 20th century. From osmo- + -phore. In sense 1 after German Osmophor.