This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well. The りつ shortens to りっ though, so keep an eye on that you splendid frood you. Oh and は changes to ぱ too. Because rendaku and all that.
My cat grew very handsome whiskers, so I named him Hige.