Words: weak yer
Part of speech: n
Definition: a yer semivowel that was reduced to an ultrashort vowel, and eventually disappeared in a modern Slavic language.
Example: Counting from the last yer in a word, the final yer is weak, the previous yer is strong, the previous yer is weak, etc., until a full vowel is reached, and then the pattern is started again with alternating weak then strong yers.