The word is in the Wiktionary

2 short excerpts of Wiktionnary (A collaborative project to produce a free-content dictionary.)

— English words —

ultracold adj. (Physics) Of a temperature close to absolute zero, especially one at which quantum-mechanical properties are observed.
ultracold adj. (Informal) Extremely cold; of utmost coldness.

22 English words from 2 English definitions

absolute absolute␣zero are close close␣to cold coldness especially Extremely Informal mechanical observed Of␣a one Physics properties quantum quantum␣mechanical temperature utmost which zero

23 words-in-word (Words found as is inside the word. Minimum size 3 letters.)

Acol acold col Col COL col- col. Col. -col- cold LTR LTRA old OLD 'old RAC rac- tra TRA ult ult. ultra ultra-

21 words-in-word RTL (Words found written from right to left, inside the word. Minimum size 3 letters.)

art Art ART 'art art. car Car CAR cart Cart CART DLO loc LoC LOC 'loc loc. loca LOCA oca RTL

One anagram found minus a letter (New word formed with all the letters from the word minus a letter.)

One cousin (New word found by changing only one letter.)

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