How to say "antibody" in Japanese

• 抗体こうたいCommon
  nounThe standard word for an antibody in the biological and medical sense, covering the protein produced by the immune system. Use this in virtually any context, from science classes to news about medicine.
• 免疫体めんえきたい
  nounAlso glossed as antibody, but it is a less common word. Learners will seldom need it; 抗体 is the usual choice, and 免疫体 appears mainly in more specialized or older-style writing.

For the medical/biological sense of 'antibody', use 抗体, the common everyday term; 免疫体 also means antibody but is less common, so it is rarely the word learners need.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

• 抗体こうたいantibody
• 免疫体めんえきたいantibody