hypodermis

/ˌhaɪpəˈdɜrmɪs/
noun
  1. The layer of skin beneath the dermis, made mostly of fat and connective tissue, that helps insulate the body and store energy.
    • When you get a shot, the needle often goes into the hypodermis just below the skin.
    • The hypodermis contains fat cells that keep your body warm in cold weather.
    • Doctors sometimes examine the hypodermis to check for signs of infection or injury.
  2. A layer of cells or tissue just below the outer surface of a plant, often used for storage or support.
    • In many cacti, the hypodermis stores water to help the plant survive dry periods.
    • Botanists study the hypodermis to understand how plants adapt to harsh environments.
    • The hypodermis of a leaf can give extra strength to the plant's structure.
Synonyms
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