the inside lower horizontal surface (as of a room, hallway, tent, or other structure)

the inside lower horizontal surface (as of a room, hallway, tent, or other structure)

the inside lower horizontal surface (as of a room, hallway, tent, or other structure)

the inside lower horizontal surface (as of a room, hallway, tent, or other structure)

the inside lower horizontal surface (as of a room, hallway, tent, or other structure)

the inside lower horizontal surface (as of a room, hallway, tent, or other structure)

the inside lower horizontal surface (as of a room, hallway, tent, or other structure)

the branch of morphology that deals with the structure of animals

cup-shaped structure of hardened bracts at the base of an acorn

cup-shaped structure of hardened bracts at the base of an acorn