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.
- hold one's peace
- hold (one's) serve (or service)
- hold one's tongue
- hold one's whisht
- hold on to
- hold (or have) a wolf by the ears
- hold (or have) in derision
- hold (or keep) someone/thing at bay
- hold (or put) a gun to someone's head
- hold out
- holdout
- hold out for
- hold out on
- holdover
- hold someone down
- hold someone in contempt
- hold someone's hand
- hold someone/thing at bay
- hold someone/thing back
- hold someone/thing cheap
- hold someone/thing dear
- hold someone/thing harmless
- hold someone/thing in contempt
- hold someone/thing off
- hold someone/thing to ransom