Prefix · deficient / below the limit
Signals a level below normal: hypothermia, hypoglycemia, hypotension, hypothesis.
Written by Bryan López, English teacher · Updated
Hypo- comes from Greek "hypo" (under, below) and is the exact antonym of hyper-. hypothermia = a dangerously low body temperature; hypoglycemia = blood sugar below normal levels; hypotension = blood pressure below normal; hypodermic = going under the skin (as a hypodermic needle does). The idea is always "less than normal" or "below the expected threshold."
In chemistry, hypo- signals a lower oxidation state than usual: hypochlorite = a chlorine ion with less oxygen than chlorite (used in bleach). In medicine, hypo- is one of the most critical prefixes: hyponatremia (low sodium), hypokalemia (low potassium), hypoventilation (insufficient breathing). Recognising hypo- can be literally vital.
Attaches mainly to medical and scientific terms with no spelling change:
Pronunciation: /ˈhaɪpəʊ/. Do not confuse with hyper- (/ˈhaɪpər/), which signals the opposite level.
hypo-/ˈhaɪpəʊ/
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"Hypothesis" comes from hypo- (under/foundational) + thesis (a position or placing): literally an idea placed as a starting point or foundation. It has no semantic relationship with "hyperbole," which comes from hyper- (over) + bole (a throw).
"Hypodermic needle" = a needle that goes under the skin to inject or extract fluids. Hypo- (below) + dermic (skin). "Dermal" and "cutaneous" describe the skin in general.
A trick to remember it
Remember the pair: hyper- = level too HIGH; hypo- = level too LOW. In medicine: hypertension = high blood pressure, hypotension = low blood pressure; hyperglycemia = high blood sugar, hypoglycemia = low blood sugar. The prefix gives you the direction before you read the rest of the word.
Exercise 1 · Form the word
Exercise 2 · Pick the right one
"The scientist proposed a ___ that would need to be tested through repeated controlled experiments."
Exercise 3 · Pick the right one
What is the correct medical antonym of "hyperglycemia"?
The prefix hypo- signals a level below normal: hypothermia, hypoglycemia, hypotension, hypothesis. In Spanish it usually maps to hipo-.
The prefix hypo- is pronounced /ˈhaɪpəʊ/. For example, "hypothermia".
"thermia" becomes "hypothermia". It is a typical example of the hypo- prefix.
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