Quadragesima (n.)
definition: The forty days of fast preceding Easter; Lent.

Quadragesima is a 12 letter word that begins with a Q and ends in an A

Quadrangular (a.)
definition: Having four angles
And consequently four sides; tetragonal.
Quadrangular is a 12 letter word that begins with a Q and ends in an R

Quadriennial (a.)
definition: Same as Quadrennial.

Quadriennial is a 12 letter word that begins with a Q and ends in an L

Quadrijugate (a.)
definition: Same as Quadrijugous.

Quadrijugate is a 12 letter word that begins with a Q and ends in an E

Quadrijugous (a.)
definition: Pinnate
With four pairs of leaflets; as a quadrijugous leaf.
Quadrijugous is a 12 letter word that begins with a Q and ends in an S

Quadrilobate (a.)
definition: Alt. of Quadrilobed

Quadrilobate is a 12 letter word that begins with a Q and ends in an E

Quadrinomial (n.)
definition: A polynomial of four terms connected by the signs plus or minus.

Quadrinomial is a 12 letter word that begins with a Q and ends in an L

Quadrivalent (a.)
definition: Having a valence of four; capable of combining with
Being replaced by or compared with four monad atoms; tetravalent; -- said of certain atoms and radicals; thus carbon and silicon are quadrivalent elements.
Quadrivalent is a 12 letter word that begins with a Q and ends in a T

Quadrumanous (a.)
definition: Having four hands; of or pertaining to the Quadrumana.

Quadrumanous is a 12 letter word that begins with a Q and ends in an S

Qualificator (n.)
definition: An officer whose business it is to examine and prepare causes for trial in the ecclesiastical courts.

Qualificator is a 12 letter word that begins with a Q and ends in an R

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