This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
• Wordosaur

n. The leading genus of Muridæ, typical of the subfamily Murinæ.

n. An abbreviation of music, musical;

n. of museum.

n. type genus of the Muridae: common house mice; the tips of the upper incisors have a square notch

"The crew became introspective, each considering the overriding mystery posed by the Cyg'mus's seeming stability in the face of irresistible forces."

mammal genus