Found:

residue

**SYNTAX: **In **checking theory**, the residue of A is the **domain** of A minus its **complement domain**.
** EXAMPLE:** In (i), the residue of X is ZP, UP, WP, H and whatever these categories dominate.

(i) XP_{1}/\ / \ UP XP_{2}/\ / \ ZP_{1}X' /\ /\ / \ / \ WP ZP_{2}X_{1}YP /\ / \ H X_{2}

LIT. | Chomsky, N. (1993) |