a. [CRYPTO- + Gr. δύναμις power, δυναμικός powerful.]
1. Relating to hidden force.
1816. Bentham, Chrestom., Wks. VIII. 87. Idioscopic or Cryptodynamic Anthropurgics has for its single-worded synonym the unexpressive appellation, Chemistry.
2. Applied to a kind of cycling gear; usually abbreviated crypto; also as sb.
1885. Cyclists’ Tour. Club Gaz., Sept., 12. Advt., The Crypto-Dynamic Gear. Ibid. (1886), IV. 139. The ‘slight friction’ incident to the use of the ‘Crypto’ at speed.
1888. Encycl. Brit., XXIII. 560. Two-speed gears are becoming general, among which may be … mentioned the Crypto-dynamic.
