(Crystallog.) | a plane passing through the optical axis of a crystal. |

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Princewood

Princified

Principal

Principal axes of a quadric

principal axis

Principal challenge

Principal contract

principal diagonal

Principal focus

principal investigator

Principal obligation

Principal of a quadric

Principal plane

Principal point

Principal ray

**-- Principal section --**

principal sum

principal type

Principality

Principality of Andorra

Principality of Liechtenstein

Principality of Monaco

Principally

Principalness

principalship

Principate

Principe

Principen

Principia

Principia data sequuntur concomitantia

Principia probant

Principial

Princewood

Princified

Principal

Principal axes of a quadric

principal axis

Principal challenge

Principal contract

principal diagonal

Principal focus

principal investigator

Principal obligation

Principal of a quadric

Principal plane

Principal point

Principal ray

principal sum

principal type

Principality

Principality of Andorra

Principality of Liechtenstein

Principality of Monaco

Principally

Principalness

principalship

Principate

Principe

Principen

Principia

Principia data sequuntur concomitantia

Principia probant

Principial