1. a person who observes or spots something
2. a device used for aiming or aligning, especially on firearms or surveying equipment
3. a trial shot fired to test accuracy before the main shooting
Usage: military; shooting sports

Examples

• The wildlife sighter reported a rare bird in the area.
• He adjusted the rifle’s sighter before taking his shot.
• The surveyor checked the sighter on his instrument.
• She fired a sighter to calibrate her aim.
• The telescope’s sighter helped locate the target star.
• Military snipers often use a sighter round first.
• The experienced sighter could spot movement from great distances.