A more thorough explanation:

glos

In Roman law, glos refers to a woman who is the sister of one's husband.

For example, if John is married to Jane, then Jane's sister would be John's glos.

Another example would be if Maria is married to Carlos, then Carlos' sister would be Maria's glos.

These examples illustrate that glos is a term used in Roman law to refer to a specific relationship between a woman and her husband's sister. It is important to note that this term is not commonly used in modern times and is specific to Roman law.