アレルギー体たい質しつ

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Meanings

1

noun

allergic predisposition; allergic diathesis

Medical term for a constitutional tendency to develop allergies; also used loosely for someone who reacts easily.

body, substance, object

質substance, quality, matter

アレルギー
アレルギー refers to a specific allergy or allergic reaction, while アレルギー体質 describes a constitutional tendency to be allergic.
体たい質しつ
体質 means 'constitution' or 'predisposition' in general; アレルギー体質 specifies an allergic constitution.

Compound of アレルギー (from German Allergie) and 体質 (constitution).