1.  beau(n = noun.person) boyfriend, fellow, swain, young man - a man who is the lover of a girl or young woman; "if I'd known he was her boyfriend I wouldn't have asked"
is a kind of lover, adult male, man

2.  beau(n = noun.person) clotheshorse, dandy, dude, fashion plate, fop, gallant, sheik, swell - a man who is much concerned with his dress and appearance;
is a kind of adult male, man
has particulars: cockscomb, coxcomb, macaroni, beau brummell, brummell, george bryan brummell

1.  A man who takes great care to dress in the latest fashion; a dandy. [1913 Webster]

2.  A man who escorts, or pays attentions to, a lady; an escort; a suitor or lover. [1913 Webster]

beau, n. (pl. beaux or beaus)
1 esp. US an admirer; a boyfriend.
2 a fop; a dandy.

Etymology:
F, = handsome, f. L bellus

N  fop, fine gentleman, swell, dandy, dandiprat, exquisite, coxcomb, beau, macaroni, blade, blood, buck, man about town, fast man, fribble, milliner, Jemmy Jessamy, carpet knight, masher, dude, fine lady, coquette, flirt, vamp.

N  love, fondness, liking, inclination, regard, dilection, admiration, fancy, affection, sympathy, fellow-feeling, tenderness, heart, brotherly love, benevolence, attachment, yearning, eros, tender passion, amour, gyneolatry, gallantry, passion, flame, devotion, fervor, enthusiasm, transport of love, rapture, enchantment, infatuation, adoration, idolatry, Cupid, Venus, myrtle, true lover's knot, love token, love suit, love affair, love tale, love story, the, old story, plighted love, courtship, amourette, free love, maternal love, storge, parental love, young love, puppy love, attractiveness, popularity, favorite, lover, suitor, follower, admirer, adorer, wooer, amoret, beau, sweetheart, inamorato, swain, young man, flame, love, truelove, leman, Lothario, gallant, paramour, amoroso, cavaliere servente, captive, cicisbeo, caro sposo, inamorata, ladylove, idol, darling, duck, Dulcinea, angel, goddess, cara sposa, betrothed, affianced, fiancee, flirt, coquette, amorette, pair of turtledoves, abode of love, agapemone, loving, fond of, taken with, struck with, smitten, bitten, attached to, wedded to, enamored, charmed, in love, love-sick, over head and ears in love, head over heels in love, affectionate, tender, sweet upon, sympathetic, loving, amorous, amatory, fond, erotic, uxorious, ardent, passionate, rapturous, devoted, motherly, loved, beloved well beloved, dearly beloved, dear, precious, darling, pet, little, favorite, popular, congenial, after one's mind, after one's taste, after one's fancy, after one's own heart, to one's mind, to one's taste, to one's fancy, to one's own heart, in one's good graces, dear as the apple of one's eye, nearest to one's heart, lovable, adorable, lovely, sweet, attractive, seductive, winning, charming, engaging, interesting, enchanting, captivating, fascinating, bewitching, amiable, like an angel, amantes amentes, credula res amor est, militat omnis amasius, love conquers all, omnia vincit amor, si vis amari ama, the sweetest joy, the wildest woe.

N  man, male, he, him, manhood, gentleman, sir, master, sahib, yeoman, wight, swain, fellow, blade, beau, elf, chap, gaffer, good man, husband, Mr, mister, boy, cock, drake, gander, dog, boar, stag, hart, buck, horse, entire horse, stallion, gibcat, tomcat, he goat, Billy goat, ram, tup, bull, bullock, capon, ox, gelding, steer, stot, androgen, homosexual, gay, queen, male, he-, masculine, manly, virile, unwomanly, unfeminine, Pron, he, him, his, hominem pagina nostra sapit, homo homini aut deus aut lupus, homo vitae commodatus non donatus est.

beau brummel, beau brummell, beau geste, beau ideal, beau monde