Origin and history of zoology

"the science of life and living things," 1819, from Greek bios "life, one's life, lifetime" (from PIE root *gwei- "to live;" see bio-) + -logy "study of." The compound was suggested 1802 by German naturalist Gottfried Reinhold Treviranus, and introduced as a scientific term that year in French by Lamarck; the two seem to have hit upon the word independently.

"the science of plants," 1690s, from botanic. The -y is from astronomy, etc. Botany Bay in Australia was named by Captain Cook (1770) on account of the great variety of plants found there; later it was a convict settlement (1778).