The Martin diameter is the length of the area bisector of an irregular object in a specified measuring direction. It is used to measure particle size in microscopy.
Saint-Martin-de-Jussac ; Occitan: Sent Martin de Jussac] is a commune in the Haute-Vienne department in the Nouvelle-Aquitaine region in west-central France.
Saint-Martin-le-Vieux ; Occitan: Sent Martin lu Vielh] is a commune in the Haute-Vienne department in the Nouvelle-Aquitaine region in west-central France.
Saint-Martin-Terressus ; Occitan: Sent Martin Tarrassos] is a commune in the Haute-Vienne department in the Nouvelle-Aquitaine region in west-central France.
