"flask" is a correct and usable word in written English.
It can be used as a noun to refer to a container made of metal or plastic, usually used to carry a small amount of liquid. For example, "He carried a flask full of his favorite beer with him to the picnic."
My mum had made me plenty of pork luncheon meat sandwiches (Mother's Pride bread of course) and I may have had a flask of tea – but I had no hat, no re-hydrating bottle of water and no sunblock as I walked to Seaforth Sands to get the unfamiliar green corpy (that is, corporation) 61 bus from the start of its route to its terminus at Aigburth.
In Patterdale, a man with a long, ginger beard sat on the side of his van every morning, eating from the lid of a flask.
Simmer until the rice is cooked then pop a portion in a flask.
"Uncle Joe's got the nog under control," said Biden, briefly flashing a metal flask protruding from the inside pocket of his suit jacket.
THE first rule for staying alive in a desert is not to pour the contents of your water flask into the sand.
He hopes to sell the flask to outdoor types and soldiers, but that is not the limit of his ambition.
During this stage, some fungi produce their sexual fruiting bodies; the apple scab (Venturia inaequalis), for example, produces perithecia, flask-shaped spore-producing structures, in fallen apple leaves.
The female gametes are formed singly in flask-shaped structures (archegonia) that also are either stalked or sunken in the gametophyte.
In teleosts (bony fishes), amphibians, reptiles, and birds there is a lagena (a curved, flask-shaped structure), with its macula, the macula lagenae.
Perithecia are globular or flask-shaped with an apical opening for discharge of ascospores.
A flask-shaped structure, it consists of a neck, with one or more layers of cells, and a swollen base the venter which contains the egg.
