hypodermic UK /ˌhaɪpəˈdɜːmɪk/US /ˌhaɪpəˈdɝmɪk/adjective 1noun 1forms 1 adjective1 •Of, or relating to the hypodermis, the layer beneath the dermis. noun1 •A hypodermic syringe, needle or injection. formshypodermics