The term BYRD BOOK is composed of four words: ALONE (5 letters), SENS (4 letters), TERP (4 letters), and IGLOO (5 letters). ALONE is an adjective meaning isolated or unaccompanied. SENS is a French word meaning feeling or sensation. TERP is a Dutch word meaning to interpret or translate. Finally, IGLOO is an Inuit word for a dome-shaped house made of snow blocks. Together, these words form the phrase 'BYRD BOOK, ' which is a reference to the book 'ALONE in the Sens Terp Igloo' by Byrd Baylor.