The Collaborative International Dictionary of English v.0.48:
Communicable \Com*mu"ni*ca*ble\ (k[o^]m*m[=u]"n[i^]*k[.a]*b'l), a. [Cf. F. communicable, LL. communicabilis.] 1. Capable of being communicated, or imparted; as, a communicable disease; communicable knowledge. [1913 Webster] 2. Communicative; free-speaking. [Obs.] --B. Jonson. -- Com*mu"ni*ca*ble*ness, n. -- Com*mu"ni*ca"bly, adv. [1913 Webster]