responder noun. [rɪ'spɒndǝ] L19.
[from RESPOND verb + -ER¹.]
1. A person who responds or replies; a respondent. L19.
b. Bridge. The partner of the opening bidder. M20.

2. a. An early form of radio receiver involving an electrolytic cell. Only in E20.
b. Radar etc. = TRANSPONDER. Also responder beacon. M20.

3. Biology & Medicine. An individual, structure, etc., that responds or reacts to some stimulus or treatment. M20.

[TahlilGaran] English Dictionary ▲