trig pillar en · NOUN
Meanings
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(UK) A triangulation pillar.
There are several prominent boundary stones close to the path which soon merges into a broad track as it heads towards the trig pillar on Round Hill.
2019, Alan Staniforth, Cleveland Way, page 64:
Forms
| Spelling | Features | Labels | Source |
|---|---|---|---|
| trig pillars | Number=Plur | lexicographic |