Do all words that end in “ry” rhyme by definition?

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It depends on how you define rhyming. Here's Wikipedia:

The word rhyme can be used in a specific and a general sense. In the specific sense, two words rhyme if their final stressed vowel and all following sounds are identical...In the general sense, general rhyme can refer to various kinds of phonetic similarity between words. https://en.wikipedia.org/wiki/Rhyme#T...ofrhyme

The most common understanding of rhyme is the "specific" rhyme, which requires matching of the final stressed vowel and all following sounds. Here are some examples of words ending in -ry which don't rhyme.

vocabulary try* penury berry sorry

• as pointed out in the first response to this question

No they do not. Whether these words rhyme depends on the way you pronounce them. And that may vary between dialects.

There are plenty of words that end in '-ry' and never rhyme, regardless of the dialect, for instance 'try' and 'constabulary'.