गुरुर्ब्रह्मा गुरुर्विष्णूः गुरुर्देवो महेश्वरः ।
गुरुः साक्षात् परब्रह्म तस्मै श्रीगुरवे नमः ॥

Meaning:
Guru is indeed the Creator in the form Lord Brahma, he is indeed the Sustainer as Lord Vishnu, and Destroyer as Lord Shiva, in fact he is the limitless Brahman, I salute to such a Guru! (Alternate) Salutations to the Guru who is himself Brahma, the creator, VishNu, the protector and Shiva, the destroyer. Who is none other than the limitless great Brahman. To Him are all my salutations.

Word meanings:
गुरुः = teacher (refers to spiritual teacher), the preceptor;
ब्रह्मा = creator;
विष्णू = Lord Vishnu, the sustainer;
देव = god;
महेश्वरः = the great Lord (Shiva);
गुरुः = teacher (refers to spiritual teacher), the preceptor;
साक्षात् = face to face;
परब्रह्म = the great Brahman;
तस्मै = to him;
श्री = relating to Prosperity; wealth; goddess LakShmi and ` shrIH’
is fem.nom.; also an honourable prefix;
गुरवे = to the teacher; preceptor;
नमः = bowing; salutation;