Entry 2 senses · 2 variants Webster, 1913 Decrescent · De·cres·cent · IPA /dɪˈkɹɛsənt/ a. n. 01 a. Becoming less by gradual diminution; decreasing; as, a decrescent moon. 1. Becoming less by gradual diminution; decreasing; as, a decrescent moon. 02 n. A crescent with the horns directed towards the sinister. 1. A crescent with the horns directed towards the sinister.(Her.)