Objectionable (a.)
definition: Liable to objection; likely to be objected to or disapproved of; offensive; as
Objectionable words.
Objectionable is a 13 letter word that begins with an O and ends in an E

Objectivation (n.)
definition: Converting into an object.

Objectivation is a 13 letter word that begins with an O and ends in an N

Objectiveness (n.)
definition: Objectivity.

Objectiveness is a 13 letter word that begins with an O and ends in an S

Observational (a.)
definition: Of a pertaining to observation; consisting of
Or containing observations.
Observational is a 13 letter word that begins with an O and ends in an L

Observatories (pl)
definition: of Observatory

Observatories is a 13 letter word that begins with an O and ends in an S

Obsigillation (n.)
definition: A sealing up.

Obsigillation is a 13 letter word that begins with an O and ends in an N

Obstetricious (a.)
definition: Serving to assist childbirth; obstetric; hence
Facilitating any bringing forth or deliverance.
Obstetricious is a 13 letter word that begins with an O and ends in an S

Obtenebration (n.)
definition: The act of darkening; the state of being darkened; darkness.

Obtenebration is a 13 letter word that begins with an O and ends in an N

Obtuse-angled (a.)
definition: Alt. of obtuse-angular

Obtuse-angled is a 13 letter word that begins with an O and ends in a D

Occasionalism (n.)
definition: The system of occasional causes; -- a name given to certain theories of the Cartesian school of philosophers
As to the intervention of the First Cause by which they account for the apparent reciprocal action of the soul and the body.
Occasionalism is a 13 letter word that begins with an O and ends in an M

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