Concise Bible Dictionary:

Daughter of Reuel, or Jethro, and wife of Moses. Apparently she circumcised her second son, and declared that Moses was “a husband of blood” to her. She had been sent back during the tribulation and deliverance of Israel, and then was brought by Jethro with her two sons to Moses. Jethro is a type of the Gentile rejoicing in the deliverance of Israel, and bringing back the loved remnant thereof in the last days (Ex. 2:2121And Moses was content to dwell with the man: and he gave Moses Zipporah his daughter. (Exodus 2:21); Ex. 4:2525Then Zipporah took a sharp stone, and cut off the foreskin of her son, and cast it at his feet, and said, Surely a bloody husband art thou to me. (Exodus 4:25); Ex. 18:22Then Jethro, Moses' father in law, took Zipporah, Moses' wife, after he had sent her back, (Exodus 18:2)).

Strong’s Dictionary of Hebrew Words:

feminine of 6833; bird; Tsipporah, Moses' wife
KJV Usage:

Jackson’s Dictionary of Scripture Proper Names:

a sparrow

Potts’ Bible Proper Names:

A little bird; a sparrow; a mourning; trumpet:―wife of Moses [ZIPPOR], Exod. 2:21. {Avicula}