pusso- combining form of puss n.1, in humorous nonce-words: pussoˈmaniac, one with a mania for cats; puˈssophilist, a lover of cats. 1890Sat.Rev. 19 July 76/1 His master..is the reverse of a pussomaniac.1891Athenæum 22 Aug. 252/3 Cat lovers—pussophilists as J. S. Mill used to call them.