Anatomy suffixes? Here are some suffixes I want to know their meaning: _-ium_ : trapezium (carpal bone) _-ius_ : trapezius (column muscle) _-ous_ : Talous and calcanous (tarsal bone) _-alis_ : Acromialis, Ulnaris (shoulder proccess and bone of forearm) _-ate_ : Capitate, Hamate, lunate (carpal bones) What is the difference between _tuber_ and _tubercle_? How to know where to use these suffixes, they are randomly given or it has to do with location or something?

These names originate from latin [1].

* _-ium_ is the second declension of a noun in accusative ( _trapezium_ refers to a bone thus is a **noun** )
* _-ius_ is a genitive adjective suffix ( _trapezius_ is the name of a muscle thus being an **adjective** )
* you have written them wrong: _talus_ and _calcaneus_ is correct. They are both nominative **nouns**.
* there is no _-alis_ suffix; it is either _-is_ or _-lis_. They are **adjective** suffixes.
* there is no _-ate_ suffix. Those are **nouns**.



_Tuber_ is the latin word for _tuberosity_. It is the quality or condition of a _tubercle_ (adjective) [2].

References:

1. Wikipedia, _Latin declension_
2. The Free Dictionary by Farlex, _Tubercle_