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 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 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: 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.

Definition: A chemical used to kill insects, birds, and mites, often used in agriculture and pest control.

Example: Farmers apply fenthion to protect their crops from pests.

Definition: A white chemical substance used to kill unwanted plants, known as a herbicide.

Example: Farmers often use fenuron to control weeds in their crops.

Definition: A type of metal that is strong and commonly used in construction and manufacturing.

Example: The bridge was built using fer to ensure its strength and durability.

Definition: A way of writing the word 'for' that reflects how it sounds in some dialects.

Example: He went to the store fer some milk.

Definition: A black powder used in farming to kill fungi and protect plants from disease.

Example: Farmers often use ferbam to prevent fungal infections in their crops.