Strong's H7970שְׁלוֹשִׁים: thirty; or (ordinal) thirtieth KJV:thirty, thirtieth. Compare H7991.
Meanings: Brown-Driver-Briggs (1906) and Strong's Hebrew Dictionary (1890), public domain, via the Open Scriptures Hebrew Bible Project (CC BY 4.0). TWOT numbers for reference only.
Root family 2403: שָׁלַשׁšālaš — do a third time, divide into three parts; three years old; be, make, triplicate; do the third time, three, threefold