gue, gu or gju /goo or gū/

A kind of viol formerly used in Shetland

• optical-electronic device
• optical-electronic devices
• optical fibre
• optical fibres
• optical illusion
• optical illusions
• optically
• optical maser
• optical masers
• optical microscope
• optical pumping
• optical spectra
• optical spectrum
• optical splitter
• optical splitters
• optical telescope
• optical tweezers
• optic axes
• optic axis
• optic disc
• optic discs
• optician
• opticians
• optic lobe
• optic lobes