cos

determiner1

1. •
   (nonstandard) Belonging to co. Gender-neutral possessive determiner, grammatically equivalent to the gendered his and her and the singular their.

   • Psychiatrists are trained to try to impose the responsibility for a patient’s problem on the patient coself, rather than on cos environment. — 1973

noun2

1. •
   (informal) Cosmetology.
2. •
   (UK) Synonym of romaine lettuce, a long-leaved variety of lettuce.

adverb1

1. •
   Consul in the year —. (Used, similarly to fl., in dating Roman texts composed by authors whose year of consulship is known, but little else for dating purposes.)