Definition: Describing a type of igneous rock that is rich in light-colored minerals, such as quartz and feldspar.

Example: The felsic rocks are often lighter in color and less dense than mafic rocks.

Definition: A type of light-colored rock that is formed from cooled magma and mainly contains feldspar and quartz.

Example: The geologist collected a sample of felsite to study its mineral composition.

Definition: Describing a type of rock that is made up of fine-grained minerals, often light in color, and is similar to granite.

Example: The geologist identified the felsitic rock during the field study.

Definition: A type of mineral that is a key component of many rocks, often used in ceramics and glassmaking.

Example: The geologist identified the felspar in the rock sample during the analysis.

Definition: A type of fine-grained volcanic rock that is similar to felsite.

Example: The geologist collected samples of felstone for further analysis.

Definition: A very small unit of time that is one quadrillionth of a second.

Example: Scientists can measure events that happen in a femtosecond, such as the movement of electrons.

Definition: A large bone in the leg that connects the hip to the knee, known as the thighbone in humans and other vertebrates.

Example: The doctor explained that a fracture in the femur can be very serious due to its size and location.

Definition: A small opening or window-like space, often found in anatomy, architecture, or zoology.

Example: The fenestra in the middle ear allows sound to pass through.

Definition: Relating to a window or an opening in a structure.

Example: The architect designed a fenestral layout to maximize natural light in the building.

Definition: A type of window frame or sash that is typically covered with cloth or paper instead of glass.

Example: The old house had several fenestrals that were beautifully decorated with colorful fabric.

Definition: Having openings or windows; characterized by the presence of windows or similar structures.

Example: The fenestrate design of the building allows for plenty of natural light.