Top Definition
A Lusus is the guardian of any and most all trolls in the webcomic homestuck. A Lusus will pick any given grub in the brooding chambers and become their guardian, much like a Parent where as trolls have none.
Example 1: Feferi's Lusus Is The Biggest Lusus Of All, A Giant Sea Creature Which Is To Be Fed Dead Bodies.

Example 2: Gamzee's Lusus Was A Sea-Goat, AKA The Capricorn Constellation.
by Silent Muse January 07, 2012
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