What is the meaning of the prefix 'Sub-'?

The prefix 'Sub-' is derived from Latin, where it holds the meaning of 'under' or 'below.' This prefix is commonly used in various English words to indicate a position that is lower or beneath something else—both physically and metaphorically. For example, 'submarine' refers to an underwater vessel, while 'subordinate' describes someone in a position lower in rank or importance.

In the context of this question, the correct answer highlights the underlying concept of 'Sub-' as it applies to a range of terms across various fields, including science, linguistics, and general vocabulary. Understanding this prefix aids in deciphering the meanings of many English words, as it forms the foundation for describing relationships of position and hierarchy.