a rod
belemiond or scaphoid
A cube is hardly an irregularly shaped object. Measuring it is the defining term of area and volume. A cube is defined as having twelve sides, all lengths uniform, all angles right angles. If the length of any side is 'a' then area = 6*a*a volume = a*a*a
cylinder
A hexagon.
element
scaphoid
a rod
The term to describe an object in the shape of a boat is "boat-shaped" or "boat-like".
belemiond or scaphoid
The term cylindrical refers to an object that is cylinder shaped. Examples of this term would be items such as food cans. Cylinders are tubed shaped objects with circles closing off both ends.
The term 'navicular' is used to describe something as boat shaped. The navicular bone in the lower ankle structure is one such example.
"Pearl tongue" is not a common or well-known term. It may refer to a poetic or metaphorical description of a tongue that is smooth, white, or has a shimmering quality similar to a pearl, but it is not a recognized anatomical term.
aerofoil
The botanical term for an egg-shaped fruit is "ovoid."
"Thumb-long" is a descriptive term used to indicate the length of an object, typically referring to something being the size of an average human thumb. It is a rough estimate used to give a general idea of the object's length.
The term you are referring to is diffraction, which is the bending of light waves around the edge of an obstacle or aperture, causing them to spread out and create interference patterns.