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‖n.; pl. Addenda [ L., fr. addere to add. ] A thing to be added; an appendix or addition. [ 1913 Webster ]

Addendum circle (Mech.), the circle which may be described around a circular spur wheel or gear wheel, touching the crests or tips of the teeth. Rankine. [ 1913 Webster ]

v. t. [ imp. & p. p. Gladdened p. pr. & vb. n. Gladdening ] [ See Glad, v. t. ] To make glad; to cheer; to please; to gratify; to rejoice; to exhilarate. [ 1913 Webster ]

A secret pleasure gladdened all that saw him. Addison. [ 1913 Webster ]

v. i. To be or become glad; to rejoice. [ 1913 Webster ]

The vast Pacific gladdens with the freight. Wordsworth. [ 1913 Webster ]

v. t. [ imp. & p. p. Maddened p. pr. & vb. n. Maddening. ] 1. To make mad; to drive to madness; to drive to insanity; to craze. [ 1913 Webster ]

2. To make very angry; to enrage; to excite violently with passion. [ 1913 Webster ]

v. i. To become mad; to act as if mad. [ 1913 Webster ]

They rave, recite, and madden round the land. Pope. [ 1913 Webster ]

adj. filled with or indicating extreme anger.
Syn. -- angered, enraged, furious, infuriated. [ WordNet 1.5 ]

adj. extremely annoying or displeasing.
Syn. -- annoying, exasperating, infuriating, vexing. [ WordNet 1.5 ]

v. t. [ imp. & p. p. Saddened p. pr. & vb. n. Saddening. ] To make sad. Specifically: (a) To render heavy or cohesive. [ Obs. ] [ 1913 Webster ]

Marl is binding, and saddening of land is the great prejudice it doth to clay lands. Mortimer. [ 1913 Webster ]

(b) To make dull- or sad-colored, as cloth. (c) To make grave or serious; to make melancholy or sorrowful. [ 1913 Webster ]

Her gloomy presence saddens all the scene. Pope. [ 1913 Webster ]

v. i. To become, or be made, sad. Tennyson. [ 1913 Webster ]