Bachelor's button
definition: A plant with flowers shaped
Several species of Ranunculus and the cornflower (Centaures cyanus) and globe a
Bachelor's button is a 17 letter word that begins with a B and ends in an N

Ballooning spider
definition: A spider which has the habit

Ballooning spider is a 17 letter word that begins with a B and ends in an R

Basedow's disease
definition: A disease characterized by e
Prominence of the eyeballs and inordinate action of the heart; -- called als
Basedow's disease is a 17 letter word that begins with a B and ends in an E

Brigadier general
definition: An officer in rank next abov
And below a major general. He commands a brigade and is sometimes called by a shortening of his title simple a brigadier.
Brigadier general is a 17 letter word that begins with a B and ends in an L

Broncho-pneumonia (n.)
definition: Inflammation of the bronchi

Broncho-pneumonia is a 17 letter word that begins with a B and ends in an A

Buffing apparatus
definition: See Buffer
1.
Buffing apparatus is a 17 letter word that begins with a B and ends in an S

 1