a. Bot. [f. L. AMENTUM + -ACEOUS.] a. Of the nature of a catkin. b. Bearing catkins.
1754. Miller, Gard. Dict., III. (J.). It [the Pine-tree] hath amentaceous Flowers, or Katkins.
1852. T. Ross, Humboldts Trav., I. vi. 213. Among amentaceous plants, the willows, oaks, and birch-trees.