Is “Maser” a Scrabble word?
Yes
MASER
Valid in at least one Scrabble dictionary
Valid in these dictionaries
SOWPODS / CSW
Scrabble UK & International
TWL / NWL
Scrabble North America
Large English Dictionary
General English word list
Meaning of Maser
/ˈmeɪzɚ/
noun
1.A device for the coherent amplification or generation of electromagnetic radiation (especially of microwave frequency) by the use of excitation energy in resonant atomic or molecular systems
2.Any celestial object that generates microwaves using the same method