Obs. or dial. [perh. = alrn, allern, OE. ælren: see ALDERN.] The alder tree.
1791. Newte, Tour Eng. & Scot., 415. The aller or arne … is also found in marshy places.
c. 1830. Trans. Highl. Soc., Ser. II. II. 216 (Jam.). An infusion of arn or alder-bark.
