Acanthopterygious (a.)
definition: Having fins in which the rays are hard and spinelike; spiny-finned.

Acanthopterygious is a 17 letter word that begins with an A and ends in an S

Angiomonospermous (a.)
definition: Producing one seed only in a seed pod.

Angiomonospermous is a 17 letter word that begins with an A and ends in an S

Anthropomorphosis (n.)
definition: Transformation into the form of a human being.

Anthropomorphosis is a 17 letter word that begins with an A and ends in an S

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

Carnal-mindedness (n.)
definition: Grossness of mind.

Carnal-mindedness is a 17 letter word that begins with a C and ends in an S

Cat o' nine tails
definition: See under Cat.

Cat o' nine tails is a 17 letter word that begins with a C and ends in an S

Charge d'affaires (n.)
definition: A diplomatic representative
Or minister of an inferior grade accredited by the government of one state to the minister of foreign affairs of another; also a substitute ad interim for an ambassador or minister plenipotentiary.
Charge d'affaires is a 17 letter word that begins with a C and ends in an S

Chiltern Hundreds
definition: A tract of crown land in Buckinghamshire and Oxfordshire
England to which is attached the nominal office of steward. As members of Parliament cannot resign when they wish to go out they accept this stewardship which legally vacates their seats.
Chiltern Hundreds is a 17 letter word that begins with a C and ends in an S

Clear-sightedness (n.)
definition: Acute discernment.

Clear-sightedness is a 17 letter word that begins with a C and ends in an S

Communicativeness (n.)
definition: The quality of being communicative.

Communicativeness is a 17 letter word that begins with a C and ends in an S

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