Titaness is the singular form of the female Titan. The plural being Titanesses. Among them are Eos, Selene, Tethys, Themis to name a few. Just as there are multiple generation Titans there are multiple generation Titanesses. For example, Mnemosyne (mother of The Muses is a First Generation Titanesses (being born to Ouranos and Gaia and Second Generation Titaness such as Leto the daughter of Koios and Phoibe or One of Okeanos' and Tethys' daughters such as Styx (the eldest of the Okeanides who is listed among the Titanesses).