Lаurie, а 52 yeаr оld female research chemist, has had a histоry оf T-cell lymphoma for 8 years. She was initially treated with systemic chemotherapy with methotrexate, until she developed mouth ulcers. Continued therapy with topical chemotherapeutic agents brought measurable improvement. She also had a history of hidradenitis. A recent physical examination showed diffuse erythroderma with scaling and hyperkeratosis, plus alopecia. She had painful leukoplakia and ulcerations of the mouth and tongue. Laurie was hospitalized and given two courses of topical chemotherapy. She was referred to dental medicine for treatment of the oral lesions and was discharged in stable condition with an appointment for follow-up in 4 weeks. Her discharge medications included the application of 2% hydrocortisone ointment to the affected lesion hs, Keralyt gel bid for the hyperkeratosis, and Dyclone and Benadryl for her stomatitis prn. Question: Define the following abbreviationsa. hsb. bidc. prn