0 past simple and past participle of spiral
He drew the line on a brown paper envelope - it spiralled around a circle.
The submembranous cortical microtubules are spiralled at an angle of about 40 to the hypothetical spermatozoon axis and form a discontinuous layer (fig. 17).
Both later denied that the crisis spiralled to the level of nuclear brinkmanship.
Externally, it exhibits two helical crest-like bodies spiralled at an angle of about 40 to the spermatozoon axis (figs 9, 10 and 21).
When these 'reasonable' requests were rejected arbitrarily, and fines imposed for leave taken without permission, discontent spiralled into strikes.
The nucleus is spiralled around the central axoneme and cross-sections reveal a kidney to horse-shoe shape (fig. 19).
At t = 220 s (40 s after the drop), the dye line, that was initially straight, has spiralled once around the vortex centre (figure 16a).
However, tensions soon spiralled out of hand.
