思し春しゅん期き早そう発はつ症しょう

Meanings

1

noun

precocious puberty; early puberty

medicine

Medical term for the onset of puberty at an abnormally early age.

early, fast

発departure, discharge, publish

症symptoms, illness

思し春しゅん期き
Refers to puberty or adolescence in general, not specifically the early onset.
早そう発はつ
Means 'early occurrence' and is used in other medical compounds like 早発閉経 (premature menopause).

Compound of 思春期 (shishunki, 'puberty') + 早発 (sōhatsu, 'early onset') + 症 (shō, 'condition'). A modern medical term.