They are lines of growth. However, this is not true of the bearded clam.
The prefix "clam" means to cry out or call, typically in a loud and forceful manner. It is derived from the Latin word "clamare," meaning "to shout."
"Clam up" means to become quiet or refuse to speak, usually due to feeling nervous, secretive, or defensive.
It mean their clam
'Clam' in Italian
A local clam found along the New England seashore of the U.S.A..
"Clam up" means to stop talking, especially when nervous, shy or unhappy. Example: A lot of men clam up when they are having emotional problems.
Calmness, Calmly
Almeja means 'clam' in Spanish.
clam
The name of the plastic piece that holds the lines to the expansion valve in a 1995 Toyota Camry is called a clam shell ventilator. As of 2013, the clam shell ventilator can be purchased for around $10, plus tax and shipping.
You will see a clam.
a clam's shell looks generally like a gray semicircle which has grooved lines running through it.