Which suffix denotes a relationship or connection to a subject?

The suffix that denotes a relationship or connection to a subject is -ine. This suffix is often used in medical terminology to indicate belonging or relating to a particular substance or subject. For example, in the word "bovine," which relates to cattle, the suffix -ine indicates a connection to the characteristics or properties of the subject being described (in this case, cattle). This relationship aspect of -ine makes it a useful suffix in various medical and scientific terms.

In contrast, the other suffixes have their own specific meanings but do not primarily convey a relationship in the same way. -ician typically denotes a specialist or professional in a field (such as "physician"). -ism refers to a practice or condition (such as "schism"), and -istry relates to a field of study or practice (such as "pharmacy"). Thus, -ine is distinct in its focus on establishing a connection or relationship with a subject.