Question

1. in the medical term intra/ven/ous, -ven- is the:

prefix
word root or stem word
combining form
suffix

1. the word part attached to the beginning of a word root in order to modify its meaning is called a(n):

compound term
prefix
suffix
modifier

Explanation:

For question 2: In medical terminology, the word root carries the core meaning of the term. In 'intra/ven/ous', '-ven-' refers to a vein, the core concept, so it is the word root.
For question 3: By definition, a prefix is a word part added to the start of a word root to alter its meaning, while suffixes go at the end, compound terms are full combined words, and "modifier" is a general, non-specific term for this context.

Answer:

1. word root or stem word
2. prefix