1. [v]  speak dogmatically
2. [v]  state as a dogma

DOGMATIZE is a 9 letter word that starts with D.

1. \Dog"ma*tize\, v. i. [imp. & p. p. {Dogmatized}; p.
   pr. & vb. n. {Dogmatizing}.] [L. dogmatizare to lay down an
   opinion, Gr. ?, fr. ?: cf. F. dogmatiser. See {Dogma}.]
   To assert positively; to teach magisterially or with bold and
   undue confidence; to advance with arrogance.
   
         The pride of dogmatizing schools.        --Blackmore.
   
   

2. \Dog"ma*tize\, v. t.
   To deliver as a dogma. [R.]