Source : Webster's Revised Unabridged Dictionary (1913)

Hindoo \Hin"doo\, or Hindu calendar \Hindu, calendar\ .
   A lunisolar calendar of India, according to which the year is
   divided into twelve months, with an extra month inserted
   after every month in which two new moons occur (once in three
   years).

   Note: The intercalary month has the name of the one which
         precedes it. The year usually commences about April 11.
         The months are follows: Baisakh . . . . . . . . . .
         April-May Jeth . . . . . . . . . . . . . May-June Asarh
         . . . . . . . . . . . . June-July Sawan (Sarawan) . . .
         . . . . July-Aug. Bhadon . . . . . . . . . . .
         Aug.-Sept. Asin (Kuar). . . . . . . . . . Sept.-Oct.
         Katik (Kartik) . . . . . . . . Oct.-Nov. Aghan . . . .
         . . . . . . . . Nov.-Dec. Pus . . . . . . . . . . . . .
         Dec.-Jan. Magh . . . . . . . . . . . . . Jan.-Feb.
         Phagun (Phalgun) . . . . . . . Feb.-March Chait . . . .
         . . . . . . . . March-April

Hindoo \Hin"doo\, Hindu \Hin"du\ (?; 277), n.; pl. {Hindoos}or
   {Hindus}. [Per. Hind[=u], fr. Hind, Hind[=u]st[=a]n, India.
   Cf. {Indian}.]
   A native inhabitant of Hindostan. As an ethnical term it is
   confined to the Dravidian and Aryan races; as a religious
   name it is restricted to followers of the Veda.

Source : WordNet®

Hindoo
     n 1: a native or inhabitant of Hindustan or India [syn: {Hindu},
          {Hindustani}]
     2: a person who adheres to Hinduism [syn: {Hindu}]

Hindoo
     adj : of or relating to or supporting Hinduism; "the Hindu faith"
           [syn: {Hindu}, {Hindi}]