Entry 1 sense Webster, 1913 Lymphoid /lĭm'-foidˌ/ · Lymph·oid · IPA /ˈlɪmfɔɪd/ 01 a. Resembling lymph; also, resembling a lymphatic gland; adenoid; as, lymphoid tissue. 1. Resembling lymph; also, resembling a lymphatic gland; adenoid; as, lymphoid tissue.(Anat.)