The Collaborative International Dictionary
Achlamydate
Achlamydate \A*chlam"y*date\, a. [Gr. 'a priv. + ?. ?. a short cloak.] (Zo["o]l.) Not possessing a mantle; -- said of certain gastropods.
Wiktionary
achlamydate
a. (context zoology English) Not possessing a mantle; -- said of certain gastropods.