EphPar 10:8.5 :ܒܫܘܠܡ ܝܪ̈ܚܐ ܬܘܒ ܩ݁ܦܣܝܢ ܥܡܕܝܢ ܒܫܘܠܡܗ ܢܒܓܝܢ ܒܫܘܪܝܗ‏ : at the completion of the (cycle of) months they once again contract, sink down at its finish, and gush out at its beginning
See the entire entry for ˁmd vb. to sink; be baptized