De-rŏg'a-to-ry, a.

(50), a. Tending to derogate or lessen in value; detracting; injurious; — with from, to, or unto.

Acts of Parliament derogatory from the power of subsequent Parliaments bind not. Blackstone.

Derogatory clause in a testament (Law), a sentence of secret character inserted by the testator alone, of which he reserves the knowledge to himself, with a condition that no will he may make thereafter shall be valid, unless this clause is inserted word for word; — a precaution to guard against later wills extorted by violence, or obtained by suggestion.