免めん疫えき細さい胞ぼう

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Meanings

1

noun

immune cell

A cell involved in the immune response, such as lymphocytes, macrophages, etc. Used in medical and biological contexts.

excuse, dismissal

疫epidemic

細dainty, get thin, taper

胞placenta, sac, sheath

免めん疫えき
免疫 (immunity) is the broader concept; 免疫細胞 refers specifically to the cells that carry out immune functions.
白はっ血けっ球きゅう
白血球 (white blood cell) is a type of immune cell, but 免疫細胞 includes other cell types like lymphocytes and macrophages.

Compound of 免疫 (immunity) + 細胞 (cell). 免疫 is a Meiji-era coinage from 免 (escape) + 疫 (epidemic), and 細胞 is a late Edo/Meiji term for biological cell.