1. Either of two fine mutually perpendicular lines that cross in the focus plane of an optical instrument and are use for sighting or calibration
   - cross hair

Derived forms: cross wires

Type of: line

Part of: graticule, reticle, reticule

• common osier
• common pea
• common people
• common pepper
• common person
• common pitcher plant
• common plantain
• common plum
• common polypody
• common pond-skater
• common privet
• common purslane
• common raccoon
• common racoon
• common ragweed
• common reed
• common room
• common rorqual
• common rose mallow
• common roundworm
• major tranquilliser
• major tranquillizer
• major-domo
• major-general
• major-league club