The singular is beau; the plural is either beaux or beaus.
singular beau (masc.) belle (fem.) plural beaux (masc.) belles (fem.) de beaux paysages - beautiful landscapes de belles voitures - beautiful cars
beau (plural 'beaux') is the masculine adjective meaning beautiful in French. The feminine form is 'belle'
Beaus or beaux is the plural of beau. Both are acceptable, although beaux is rather old-fashioned.
The singular form of the demonstrative pronoun 'these' is this.
The singular form of feet is foot.
The singular form of "hypothysis" is "hypothesis."
The singular form is ombudsman.
it is already in its singular form.
The singular form is money.
The singular form of "cuffs" is cuff.
The singular form is hilum.
The singular form in stimulus.