adjective, peakier, peakiest.

1870–75; peak(ed)2 + -y1

peakily, adverb
peakiness, noun Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
peak (piːk)
1.  a pointed end, edge, or projection: the peak of a roof
2.  the pointed summit of a mountain
3.  a mountain with a pointed summit
4.  the point of greatest development, strength, etc: the peak of his career
5.  a.  a sharp increase in a physical quantity followed by a sharp decrease: a voltage peak
 b.  the maximum value of this quantity
 c.  (as modifier): peak voltage
6.  Also called: visor a projecting piece on the front of some caps
7.  a.  See widow's peak
 b.  the pointed end of a beard
8.  nautical
 a.  the extreme forward (forepeak) or aft (afterpeak) part of the hull
 b.  (of a fore-and-aft quadrilateral sail) the after uppermost corner
 c.  the after end of a gaff
9.  (tr) nautical to set (a gaff) or tilt (oars) vertically
10.  to form or reach or cause to form or reach a peak or maximum
11.  of or relating to a period of highest use or demand, as for watching television, commuting, etc: peak viewing hours; peak time
[C16: perhaps from pike², influenced by beak1; compare Spanish pico, French pic, Middle Low German pēk]

peaky (ˈpiːkɪ)
adj , -kier, -kiest
wan, emaciated, or sickly
[C16: of uncertain origin]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
But the tulips stood up twice as stiff as before, and they looked quite peaky in the face and quite red, for they had been vexed.
Both air conditioners and distribution transformers have peaky loads that strongly correlate to overall system loads.
Both these equipment types have peaky loads that are strongly correlated to the overall electric system peak.
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