top hat

noun — 2 senses

top hat

noun

1

A man's formal hat, with a tall cylindrical crown (often of silk).

2

Business, Construction, Manufacturing A kind of steel batten.

The car body is a light steel shell fabricated by welding from top-hat, channel, and Z sections.1958 April 23, “Diesel Railbus for British Railways”, in Railway Magazine, page 276:

Synonyms: stovepipe hat, topper
Derived terms: top-hatless, top-hat pension, top-hat plan, top-hatted, top-hatting, top-hat transform

Entry derived from the Wiktionary, under licence CC BY-SA 4.0 — list of authors.