1. Fish of deep dark waters having a light organ below each eye
   - flashlight fish

Type of: acanthopterygian, spiny-finned fish

• hexad
• hexadecanoic acid
• hexadecimal
• hexadecimal digit
• hexadecimal notation
• hexadecimal number system
• hexadecimal system
• Hexadrol
• hexagon
• hexagonal
• hexagram
• Hexagrammidae
• Hexagrammos
• Hexagrammos decagrammus
• hexahedron
• Hexalectris
• Hexalectris spicata
• Hexalectris warnockii
• hexamerous
• hexameter
• Hexamita
• Hexanchidae
• Hexanchus
• Hexanchus griseus
• hexane