Monier-Williams: A Sanskrit-English Dictionary (p. 90)
arjuna, mfn. (cf. ṛijra and √ raj) white, clear (the colour of the day, RV. vi, 9, 1; of the dawn, RV. i, 49, 3; of the lightning; of the milk; of silver, &c.); made of silver, AV. iv, 37, 4; as, m. the white colour, L.; a peacock, L.; cutaneous disease, Sāy. on RV. i, 122, 5; the tree Terminalia arjuna W. and A.; N. of a man, RV. i, 122, 5; of Indra, VS.; ŚBr.; of the third of the Pāṇḍava princes (who was a son of Indra and Kuntī), MBh. &c.; of a son of Kṛitavīrya (who was slain by Paraśurāma) ib.; of a Śākya (known as a mathematician); of different other persons; the only son of his mother, L.; (ī) f. a cow, MBh. xiii, 3596; a kind of serpent, (voc. arjuni) AV. ii, 24, 7; a procuress, bawd, L.; N. of Ushā (wife of Aniruddha), L.; of the river Bāhudā or Karatoyā, L.; (-nyau, or -nyas) f. du. or pl., N. of the constellation Phalgunī, RV. x, 85, 13; ŚBr.; (am) n. silver, AV. v, 28, 5 & 9; gold, L.; slight inflammation of the conjunctiva or white of the eye, Suśr.; a particular grass (used as a substitute for the Soma plant), PBr. &c.; (= rūpa) shape, Naigh.; (ās), m. pl. the descendants of Arjuna, Pāṇ. ii, 4, 66, Sch.

Monier-Williams: A Sanskrit-English Dictionary (p. 241)
mfn. lofty, excelling, distinguished VS. TS.; m. a kind of evil spirit AV. viii, 6, 10; a kind of bird Svapnac.; the tree Terminalia arjuna MBh. Suśr. &c.; a part of the Indian lute called the belly (a wooden vessel covered with leather placed under its neck to render the sound deeper, or a crooked piece of wood at the end of the lute), L.; (in mus.) a particular Rāga or mode; a kind of disease, L.; N. of a man g. tika-kitav di Pāṇ. 2-4, 68; of a mountain BhP.; (ā) f. space, region, L.; (in mus.) a particular Rāgiṇī; (am) n. the flower of Terminalia arjuna Kāvy d. 241,3

Tamil Lexicon, University of Madras (p. 3093)
marutu: 1. Arjuna; 2. Black winged myrobalan; 3. Flowering murdah

Tamil Lexicon, University of Madras (p. 2306)
nīrmarutu: Arjuna, l. tr., Terminalia arjuna

Tamil Lexicon, University of Madras (p. 3803)
veḷḷaimarutu: 1. Flowering murdah, 2. Arjuna

Dymock, Warden, Hooper: Pharmacographia Indica (vol. II, pp. 11-12)
Terminalia arjuna, Combretaceae
This tree is the Arjuna and Kukubha of Chakradatta, who describes it as tonic, astringent, and cooling, and prescribes it in heart disease and for those purposes for which astringent are generally applied. He recommends it to be given in milk, treacle or water when used internally, or as a ghrita (medicinal butter) made with the decoction and powder of the bark.
Hindu physicians think that the bark has some special virtue in promoting the union of fractures, and the dispersion of ecchymosis when given internally. It is considered to be Asmari-hara, or lithontripic, and a reference to the chemical composition will show that the ash of the bark contains an extraordinarily large proportion of calcium carbonate. Externally it is used in the form of an astringent wash to ulcers.