erratic

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erratic

a piece of rock that differs in composition, shape, etc., from the rock surrounding it, having been transported from its place of origin, esp by glacial action
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

erratic

[ə′rad·ik]
(geology)
A rock fragment that has been transported a great distance, generally by glacier ice or floating ice, and differs from the bedrock on which it rests.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
They found that the erraticism of the real exchange rate had some effects on semiconductor exports both in the short run and the long run.
The erraticism of President Donald Trump's administration has magnified regional doubts about US staying power, a perennial Southeast Asian concern, adding strategic uncertainty and further complicating the pursuit of unified ASEAN positions.
Figure 2 illustrates that as the company's production days of inventory rose erratically, production days of SG&A rose, too, though with less erraticism. Among the 21 companies with contrary tendencies is Lennox International (air conditioning/heating appliances).
Abdullatif Al-Shehri, Takatof volunteer team leader, said: "Volunteering in the Kingdom is characterized by erraticism and disorganization due to the absence of controls and regulations, causing irregularities and disastrous results occasionally." Al-Shehri warned that some organizations might exploit young people on behalf of volunteering for personal interests, as it happens in some events, conferences and seminars.