English Words Starting With R

• root crop

  nounC1
  /ˈruːt ˌkrɒp/A plant cultivated primarily for its edible, starchy root or other underground plant part that serves as a major food source.
• root division

  nounLow/Technical
  /ˌruːt dɪˈvɪʒn̩/A mathematical operation of dividing a number by another to find a root (e.g., calculating a square root by a specific method).
• root doctor

  nounLow
  /ˈruːt ˌdɒk.tə/A traditional folk healer, especially in African American and Southern US cultures, who uses herbs, roots, and spiritual practices for healing, protection, and sometimes harm.
• root ginger

  nounB2
  /ˌruːt ˈdʒɪndʒə/A piece of ginger rhizome (Zingiber officinale) in its raw, unprocessed form, typically with a brown, knobby skin.
• root graft

  nounLow
  /ˈruːt ɡrɑːft/To join two plants or trees by connecting their living tissue so that they grow as one plant, often to combine desirable rootstock with a fruiting or flowering scion.
• root hair

  nounLow
  /ruːt hɛər/A microscopic, hair-like extension of a plant root epidermal cell that absorbs water and minerals.
• root knot

  nounLow
  /ˈruːt nɒt/A swelling or gall on the root of a plant, especially caused by nematode infection.
• root mean square

  nounlow
  /ruːt miːn skweər/The square root of the arithmetic mean of the squares of a set of values.
• root nodule

  nounC1/C2
  /ˈruːt ˈnɒdjuːl/A small, swollen growth on the roots of certain plants, especially legumes, that houses nitrogen-fixing bacteria (Rhizobia).
• root of unity

  nounVery low
  /ruːt əv ˈjuːnɪti/In mathematics, a complex number that yields 1 when raised to some positive integer power n.
• root out

  verbB2
  /ˌruːt ˈaʊt/To find and remove something harmful or unwanted completely and permanently.
• root position

  nounB2
  /ˈruːt pəˌzɪʃ.ən/The fundamental or basic location, arrangement, or state of something; specifically in grammar, the standard, unmodified position of a word or element.
• root pressure

  nounLow
  /ˈruːt ˌpreʃ.ər/The positive pressure that develops in the roots of plants, forcing water and dissolved minerals upward into the xylem vessels.
• root rot

  nounLow
  /ˈruːt ˌrɒt/A plant disease characterized by the decay of a plant's root system, often caused by fungi or overly wet soil conditions.
• root test

  nounC2
  /ˈruːt ˌtɛst/A mathematical procedure used to determine the convergence or divergence of an infinite series by examining the limit of the nth root of the absolute value of its terms.
• root treatment

  nounC1
  /ˈruːt ˌtriːtmənt/A dental procedure to treat infection or damage in the root canal of a tooth.
• root up

  verbC2
  /ˌruːt ˈʌp/To tear, dig, or pull something (typically a plant or structure) out of the ground by its roots; to remove completely.
• root-canal therapy

  nounC1
  /ˈruːt kəˌnæl ˈθɛrəpi/A dental procedure to treat infection at the center of a tooth (the pulp) by removing the inflamed or infected pulp, cleaning and disinfecting the root canals, then filling and sealing them.
• rootage

  nounlow
  /ˈruːtɪdʒ/the act, process, or result of taking root or establishing roots.
• rootball

  nounC2 / Low
  /ˈruːt.bɔːl/The densely matted mass of roots and soil that is lifted with a plant when it is dug up.

Showing 4821–4840 of 5802 words.