osphradium
/ɒsˈfreɪdɪəm/Zoology
noun
An olfactory organ in some gastropod molluscs, consisting of an area of sensitive tissue on the gill membranes.
Origin
Late 19th century; earliest use found in Ray Lankester (1847–1929), zoologist. From Byzantine Greek ὄσϕρα smell (from ancient Greek ὀσϕραίνεσθαι to smell from ὀσ-, reduced form of stem ὀδ- + -ϕραίνεσθαι from ϕρεν-, ϕρήν mind: see phren) + -idium.