| BOTTOMLESS | • bottomless adj. Having no bottom. • bottomless adj. Extremely deep. • bottomless adj. Having no bounds; limitless. |
| COELOSTATS | • coelostats n. Plural of coelostat. • COELOSTAT n. an astronomical instrument used to reflect light on to a telescope. |
| COLTSFOOTS | • coltsfoots n. Plural of coltsfoot. • colt's-foots n. Plural of colt’s-foot. • colt's␣foots n. Plural of colt’s foot. |
| FOOTSTALKS | • footstalks n. Plural of footstalk. • FOOTSTALK n. the stalk of a leaf or a flower. |
| FOOTSTALLS | • footstalls n. Plural of footstall. • FOOTSTALL n. a pedestal or plinth. |
| FOOTSTOOLS | • footstools n. Plural of footstool. • foot-stools n. Plural of foot-stool. • FOOTSTOOL n. a stool for placing one's feet on when sitting. |
| OCTOSTYLES | • octostyles n. Plural of octostyle. • OCTOSTYLE n. a building with eight columns, also OCTASTYLE. |
| OSTEOBLAST | • osteoblast n. (Biology, cytology) A mononucleate cell from which bone develops. • OSTEOBLAST n. one of the protoplasmic cells from or around which the matrix of the bone is developed. |
| OSTEOCLAST | • osteoclast n. (Physiology, cytology) A large multinuclear cell associated with the resorption of bone. • osteoclast n. (Surgery) An instrument for performing osteoclasis. • OSTEOCLAST n. an instrument used in osteoclasis. |
| OTOLOGISTS | • otologists n. Plural of otologist. • OTOLOGIST n. a practitioner of otology, the study of the ear. |
| ROOTSTALKS | • rootstalks n. Plural of rootstalk. • ROOTSTALK n. an underground stem producing roots and leafy shoots, aka rhizome. |
| SITOSTEROL | • sitosterol n. (Organic chemistry) Any of a range of plant sterols used to prepare steroid hormones. • SITOSTEROL n. any of several sterols widespread in plant products. |
| STEPSTOOLS | • stepstools n. Plural of stepstool. • step␣stools n. Plural of step stool. • STEPSTOOL n. a stool able to be used as a step. |
| TOADSTOOLS | • toadstools n. Plural of toadstool. • TOADSTOOL n. any of several spore-producing, poisonous, umbrella-shaped fungi. |
| TONOPLASTS | • tonoplasts n. Plural of tonoplast. • TONOPLAST n. a semipermeable membrane surrounding a plant vacuole. |
| TOOLCHESTS | • toolchests n. Plural of toolchest. • tool␣chests n. Plural of tool chest. • TOOLCHEST n. a chest for holding tools. |