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There are 20 thirteen-letter words containing OSPO

AECIDIOSPORES• AECIDIOSPORE n. a spore produced in an aecidium.
ARTHROSPOROUS• arthrosporous adj. Relating to arthrospores.
• ARTHROSPOROUS adj. of or like an arthrospore, also ARTHROSPORIC.
BALLISTOSPORE• ballistospore n. (Mycology) A spore that is ejected or shot off.
• BALLISTOSPORE n. a spore, esp. a fungal spore, that is forcefully ejected from its source.
BASIDIOSPORES• basidiospores n. Plural of basidiospore.
• BASIDIOSPORE n. a spore produced by a basidium.
CEPHALOSPORIN• cephalosporin n. Any of a class of natural and synthetic antibiotics developed from Acremonium fungi, having a cepham structure.
• CEPHALOSPORIN n. any of a group of wide-spectrum antibiotics derived from the fungus Cephalosporin.
CHLAMYDOSPORE• chlamydospore n. A thick-walled spore that is the resting stage of some bacteria.
• CHLAMYDOSPORE n. a thick-walled usually resting fungal spore.
CONIDIOSPORES• conidiospores n. Plural of conidiospore.
• CONIDIOSPORE n. a conidium.
COSPONSORSHIP• cosponsorship n. Joint sponsorship by more than one party.
• COSPONSORSHIP n. the state of being a cosponsor.
CYCLOSPORINES• cyclosporines n. Plural of cyclosporine.
• CYCLOSPORINE n. an immunosuppressive drug used in organ transplants, also CYCLOSPORIN.
HETEROSPORIES• HETEROSPORY n. the production of microspores and megaspores, as in seed plants.
HETEROSPOROUS• heterosporous adj. (Botany, of an organism) Producing both male and female gametophytes.
• HETEROSPOROUS adj. producing two different sizes or kinds of spores.
ISOSPONDYLOUS• isospondylous adj. (Zoology) Of or pertaining to the Isospondyli.
• isospondylous adj. (Zoology) Having the anterior vertebrae separate and normal.
• ISOSPONDYLOUS adj. of, relating to, or belonging to the Isospondyli, an order of soft-finned teleost fishes that includes the herring, salmon, trout, and pike.
PARTHENOSPORE• PARTHENOSPORE n. a thick-walled spore produced by parthenogenesis in certain algae and fungi.
PITYROSPORUMS• PITYROSPORUM n. a yeastlike fungus which can cause pityriasis.
PYCNIDIOSPORE• pycnidiospore n. A spore from a pycnidium.
• PYCNIDIOSPORE n. a conidium produced in a pycnidium, also PYCNOSPORE.
TELEUTOSPORES• teleutospores n. Plural of teleutospore.
• TELEUTOSPORE n. a thick-walled winter spore of the rust fungi, producing a promycelium on germination.
TELEUTOSPORIC• teleutosporic adj. Relating to teleutospores.
• TELEUTOSPORIC adj. of or like a teleutospore, a thick-walled winter spore of the rust fungi.
UREDINIOSPORE• urediniospore n. (Botany) A spore produced by a uredinium.
• UREDINIOSPORE n. the thin-walled summer spore which is produced during the so-called Uredo stage of certain rusts, also UREDIOSPORE, UREDOSPORE.
ZOOSPORANGIAL• zoosporangial adj. Of or pertaining to zoosporangia.
• ZOOSPORANGIAL adj. relating to zoosporangia.
ZOOSPORANGIUM• zoosporangium n. (Botany) A sporangium, or conceptacle containing or producing zoospores.
• zoösporangium n. Alternative spelling of zoosporangium.
• ZOOSPORANGIUM n. a spore case or sporangium bearing zoospores.

Scrabble words — in black are valid world wide — in RED are not valid in North America — in GREEN are valid only in North America.
Definitions are short excerpt from the 1Word.ws and WikWik.org.

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