ptygma
/ˈtɪɡmə/Geology
noun
A ptygmatic fold.
Origin
1940s; earliest use found in Transactions of the Royal Society of Edinburgh. From ancient Greek πτύγμα fold, anything folded (from the stem of πτύσσειν to fold + -μα), after ptygmatic.
- wainscotting
- wainwright
- Wainwright, Jonathan Mayhew
- Waipahu
- wairua
- WAIS
- waist
- waistband
- waist cloth
- waistcoat
- waist-deep
- waisted
- waist-high
- waistless
- waistline
- wait
- wait-a-bit
- wait-a-bit thorn
- wait and see
- Waitangi Day
- Waitangi, Treaty of
- Waite, Morrison Remick
- waiter
- wait for it
- wait for the other shoe to drop