[they-leez] 
| c640–546? b.c., Greek philosopher, born in Miletus. |
| Tha·les (thā'lēz) Greek philosopher who is traditionally considered the first Western philosopher and a founder of geometry and abstract astronomy. He maintained that matter is composed of water. Tha·le'sian (thā-lē'zhən) adj. |
| Thales (thā'lēz) Pronunciation Key
Greek philosopher who was considered by later Greek writers to be a founder of geometry and abstract astronomy. He is said to have accurately predicted a solar eclipse in 585 BCE, although this and certain other stories associated with Thales have been questioned by modern scholars. |
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