From Wiktionary, the free dictionary
Variant of tetchy, of uncertain origin.
tachy
- (obsolete) Alternative form of tetchy.
Clipping of terms prefixed with tachy-.
tachy
- (medicine, colloquial) Tachycardia.
- (medicine, colloquial) Tachypnoea.
tachy (not comparable)
- (medicine, colloquial) Tachycardic.