Ekādasakamātikā

Abhidhammapiṭaka · Dhammasaṅgaṇī · Vol. 34 · Section 537

[537] Which is that form which is the impermanence of form (rūpassa aniccatā)? That which is the destruction (khaya), passing away (vaya), breaking up (bheda), disintegration (paribheda), impermanence (aniccatā), disappearance (antaradhāna) of form — this is that form which is the impermanence of form.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.

This passage also appears in 1 other place

Vol. 34 · Section 586 — Ekādasakamātikā